ImageMagick 7.0.8-50 Q16 has a heap-based buffer overflow in MagickCore/fourier.c in ComplexImage.
### Prerequisites

- [x] I have written a descriptive issue title
- [x] I have verified that I am using the latest version of ImageMagick
- [x] I have searched [open](https://github.com/ImageMagick/ImageMagick/issues) and [closed](https://github.com/ImageMagick/ImageMagick/issues?q=is%3Aissue+is%3Aclosed) issues to ensure it has not already been reported

### Description
<!-- A description of the bug or feature -->
There's a heap-buffer-overflow in MagickCore/fourier.c:299:18 in ComplexImage, and I compiled the lasted version with --disable-openmp option.

### Steps to Reproduce
<!-- List of steps, sample code, failing test or link to a project that reproduces the behavior.
     Make sure you place a stack trace inside a code (```) block to avoid linking unrelated issues -->
run cmd:
`magick -seed 0 -mattecolor rgb"("225,230,14")" -debug Configure "(" magick:wizard +repage ")" "(" magick:netscape +repage ")" -fuzz 82 -caption "j$Y%Be" -blue-primary 727,475  -crop 405%-43-16 -crop 832x886>+11-13 -complex magnitude-phase   tmp`

and also this command
`magick -seed 0 "(" magick:netscape +repage ")" "(" magick:wizard -resample 24x44 -resample 47x83  ")" "(" magick:netscape -charcoal 4 -random-threshold 42x71 -shade 81x21  ")" -complex magnitude-phase   tmp112
`

Here's ASAN result.
```
==9231==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x7fd97efce800 at pc 0x7fd98dbdd221 bp 0x7ffff99e9790 sp 0x7ffff99e9788
WRITE of size 4 at 0x7fd97efce800 thread T0
    #0 0x7fd98dbdd220 in ComplexImages MagickCore/fourier.c:299:18
    #1 0x7fd98d4038c1 in CLIListOperatorImages MagickWand/operation.c:3890:22
    #2 0x7fd98d40f34e in CLIOption MagickWand/operation.c:5276:14
    #3 0x7fd98d250a99 in ProcessCommandOptions MagickWand/magick-cli.c:477:7
    #4 0x7fd98d251d0a in MagickImageCommand MagickWand/magick-cli.c:796:5
    #5 0x7fd98d29bba1 in MagickCommandGenesis MagickWand/mogrify.c:185:14
    #6 0x526f95 in MagickMain utilities/magick.c:149:10
    #7 0x5268e1 in main utilities/magick.c:180:10
    #8 0x7fd987d12b96 in __libc_start_main /build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:310
    #9 0x41b069 in _start (install/bin/magick+0x41b069)

0x7fd97efce800 is located 0 bytes to the right of 3686400-byte region [0x7fd97ec4a800,0x7fd97efce800)
allocated by thread T0 here:
    #0 0x4e6200 in __interceptor_posix_memalign (install/bin/magick+0x4e6200)
    #1 0x7fd98dc8a666 in AcquireAlignedMemory MagickCore/memory.c:265:7
    #2 0x7fd98d9d36ac in OpenPixelCache MagickCore/cache.c:3728:46
    #3 0x7fd98d9d9991 in GetImagePixelCache MagickCore/cache.c:1754:18
    #4 0x7fd98d9dfc59 in SyncImagePixelCache MagickCore/cache.c:5494:28
    #5 0x7fd98dc3dfc1 in SetImageStorageClass MagickCore/image.c:2627:10
    #6 0x7fd98dbdb4f7 in ComplexImages MagickCore/fourier.c:185:7
    #7 0x7fd98d4038c1 in CLIListOperatorImages MagickWand/operation.c:3890:22
    #8 0x7fd98d40f34e in CLIOption MagickWand/operation.c:5276:14
    #9 0x7fd98d250a99 in ProcessCommandOptions MagickWand/magick-cli.c:477:7
    #10 0x7fd98d251d0a in MagickImageCommand MagickWand/magick-cli.c:796:5
    #11 0x7fd98d29bba1 in MagickCommandGenesis MagickWand/mogrify.c:185:14
    #12 0x526f95 in MagickMain utilities/magick.c:149:10
    #13 0x5268e1 in main utilities/magick.c:180:10
    #14 0x7fd987d12b96 in __libc_start_main /build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:310

SUMMARY: AddressSanitizer: heap-buffer-overflow MagickCore/fourier.c:299:18 in ComplexImages

```

### System Configuration
<!-- Tell us about the environment where you are experiencing the bug -->

- ImageMagick version:
Version: ImageMagick 7.0.8-50 Q16 x86_64 2019-06-17 https://imagemagick.org
- Environment (Operating system, version and so on):
Description:	Ubuntu 18.04.1 LTS
Release:	18.04
Codename: bionic


- Additional information:
CC=clang-7 CXX=clang++-7 ./configure --disable-openmp
<!-- Thanks for reporting the issue to ImageMagick! -->

heap-buffer-overflow in MagickCore/fourier.c:299:18 in ComplexImage
This is a GitHub Issue
repo:ImageMagick
owner:ImageMagick
Title : heap-buffer-overflow in MagickCore/fourier.c:299:18 in ComplexImage
Issue date:

--- start body ---
### Prerequisites

- [x] I have written a descriptive issue title
- [x] I have verified that I am using the latest version of ImageMagick
- [x] I have searched [open](https://github.com/ImageMagick/ImageMagick/issues) and [closed](https://github.com/ImageMagick/ImageMagick/issues?q=is%3Aissue+is%3Aclosed) issues to ensure it has not already been reported

### Description
<!-- A description of the bug or feature -->
There's a heap-buffer-overflow in MagickCore/fourier.c:299:18 in ComplexImage, and I compiled the lasted version with --disable-openmp option.

### Steps to Reproduce
<!-- List of steps, sample code, failing test or link to a project that reproduces the behavior.
     Make sure you place a stack trace inside a code (```) block to avoid linking unrelated issues -->
run cmd:
`magick -seed 0 -mattecolor rgb"("225,230,14")" -debug Configure "(" magick:wizard +repage ")" "(" magick:netscape +repage ")" -fuzz 82 -caption "j$Y%Be" -blue-primary 727,475  -crop 405%-43-16 -crop 832x886>+11-13 -complex magnitude-phase   tmp`

and also this command
`magick -seed 0 "(" magick:netscape +repage ")" "(" magick:wizard -resample 24x44 -resample 47x83  ")" "(" magick:netscape -charcoal 4 -random-threshold 42x71 -shade 81x21  ")" -complex magnitude-phase   tmp112
`

Here's ASAN result.
```
==9231==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x7fd97efce800 at pc 0x7fd98dbdd221 bp 0x7ffff99e9790 sp 0x7ffff99e9788
WRITE of size 4 at 0x7fd97efce800 thread T0
    #0 0x7fd98dbdd220 in ComplexImages MagickCore/fourier.c:299:18
    #1 0x7fd98d4038c1 in CLIListOperatorImages MagickWand/operation.c:3890:22
    #2 0x7fd98d40f34e in CLIOption MagickWand/operation.c:5276:14
    #3 0x7fd98d250a99 in ProcessCommandOptions MagickWand/magick-cli.c:477:7
    #4 0x7fd98d251d0a in MagickImageCommand MagickWand/magick-cli.c:796:5
    #5 0x7fd98d29bba1 in MagickCommandGenesis MagickWand/mogrify.c:185:14
    #6 0x526f95 in MagickMain utilities/magick.c:149:10
    #7 0x5268e1 in main utilities/magick.c:180:10
    #8 0x7fd987d12b96 in __libc_start_main /build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:310
    #9 0x41b069 in _start (install/bin/magick+0x41b069)

0x7fd97efce800 is located 0 bytes to the right of 3686400-byte region [0x7fd97ec4a800,0x7fd97efce800)
allocated by thread T0 here:
    #0 0x4e6200 in __interceptor_posix_memalign (install/bin/magick+0x4e6200)
    #1 0x7fd98dc8a666 in AcquireAlignedMemory MagickCore/memory.c:265:7
    #2 0x7fd98d9d36ac in OpenPixelCache MagickCore/cache.c:3728:46
    #3 0x7fd98d9d9991 in GetImagePixelCache MagickCore/cache.c:1754:18
    #4 0x7fd98d9dfc59 in SyncImagePixelCache MagickCore/cache.c:5494:28
    #5 0x7fd98dc3dfc1 in SetImageStorageClass MagickCore/image.c:2627:10
    #6 0x7fd98dbdb4f7 in ComplexImages MagickCore/fourier.c:185:7
    #7 0x7fd98d4038c1 in CLIListOperatorImages MagickWand/operation.c:3890:22
    #8 0x7fd98d40f34e in CLIOption MagickWand/operation.c:5276:14
    #9 0x7fd98d250a99 in ProcessCommandOptions MagickWand/magick-cli.c:477:7
    #10 0x7fd98d251d0a in MagickImageCommand MagickWand/magick-cli.c:796:5
    #11 0x7fd98d29bba1 in MagickCommandGenesis MagickWand/mogrify.c:185:14
    #12 0x526f95 in MagickMain utilities/magick.c:149:10
    #13 0x5268e1 in main utilities/magick.c:180:10
    #14 0x7fd987d12b96 in __libc_start_main /build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:310

SUMMARY: AddressSanitizer: heap-buffer-overflow MagickCore/fourier.c:299:18 in ComplexImages

```

### System Configuration
<!-- Tell us about the environment where you are experiencing the bug -->

- ImageMagick version:
Version: ImageMagick 7.0.8-50 Q16 x86_64 2019-06-17 https://imagemagick.org
- Environment (Operating system, version and so on):
Description:	Ubuntu 18.04.1 LTS
Release:	18.04
Codename: bionic


- Additional information:
CC=clang-7 CXX=clang++-7 ./configure --disable-openmp
<!-- Thanks for reporting the issue to ImageMagick! -->

--- end body ---
