libswscale/swscale.c:3280: error: Null Dereference
  pointer `filter` last assigned on line 3274 could be null and is dereferenced at line 3280, column 9.

libswscale/swscale.c:3269:1: start of procedure sws_getDefaultFilter()
3267. #endif
3268. 
3269. SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,
      ^
3270.                                 float lumaSharpen, float chromaSharpen,
3271.                                 float chromaHShift, float chromaVShift,

libswscale/swscale.c:3274:5: 
3272.                                 int verbose)
3273. {
3274.     SwsFilter *filter= av_malloc(sizeof(SwsFilter));
          ^
3275. 
3276.     if (lumaGBlur!=0.0){

libavutil/mem.c:47:1: start of procedure av_malloc()
  45.    linker will do it automatically. */
  46. 
  47. void *av_malloc(unsigned int size)
      ^
  48. {
  49.     void *ptr = NULL;

libavutil/mem.c:49:5: 
  47. void *av_malloc(unsigned int size)
  48. {
  49.     void *ptr = NULL;
          ^
  50. #if CONFIG_MEMALIGN_HACK
  51.     long diff;

libavutil/mem.c:55:8: Taking false branch
  53. 
  54.     /* let's disallow possible ambiguous cases */
  55.     if(size > (INT_MAX-16) )
             ^
  56.         return NULL;
  57. 

libavutil/mem.c:66:9: Taking true branch
  64.     ((char*)ptr)[-1]= diff;
  65. #elif HAVE_POSIX_MEMALIGN
  66.     if (posix_memalign(&ptr,16,size))
              ^
  67.         ptr = NULL;
  68. #elif HAVE_MEMALIGN

libavutil/mem.c:67:9: 
  65. #elif HAVE_POSIX_MEMALIGN
  66.     if (posix_memalign(&ptr,16,size))
  67.         ptr = NULL;
              ^
  68. #elif HAVE_MEMALIGN
  69.     ptr = memalign(16,size);

libavutil/mem.c:99:5: 
   97.     ptr = malloc(size);
   98. #endif
   99.     return ptr;
           ^
  100. }
  101. 

libavutil/mem.c:100:1: return from a call to av_malloc
   98. #endif
   99.     return ptr;
  100. }
       ^
  101. 
  102. void *av_realloc(void *ptr, unsigned int size)

libswscale/swscale.c:3276:9: Taking false branch
3274.     SwsFilter *filter= av_malloc(sizeof(SwsFilter));
3275. 
3276.     if (lumaGBlur!=0.0){
              ^
3277.         filter->lumH= sws_getGaussianVec(lumaGBlur, 3.0);
3278.         filter->lumV= sws_getGaussianVec(lumaGBlur, 3.0);

libswscale/swscale.c:3280:9: 
3278.         filter->lumV= sws_getGaussianVec(lumaGBlur, 3.0);
3279.     }else{
3280.         filter->lumH= sws_getIdentityVec();
              ^
3281.         filter->lumV= sws_getIdentityVec();
3282.     }

libswscale/swscale.c:3363:1: start of procedure sws_getIdentityVec()
  3361. 
  3362. 
  3363. SwsVector *sws_getIdentityVec(void){
        ^
  3364.     return sws_getConstVec(1.0, 1);
  3365. }

libswscale/swscale.c:3364:5: Skipping sws_getConstVec(): empty list of specs
  3362. 
  3363. SwsVector *sws_getIdentityVec(void){
  3364.     return sws_getConstVec(1.0, 1);
            ^
  3365. }
  3366. 

libswscale/swscale.c:3365:1: return from a call to sws_getIdentityVec
  3363. SwsVector *sws_getIdentityVec(void){
  3364.     return sws_getConstVec(1.0, 1);
  3365. }
        ^
  3366. 
  3367. double sws_dcVec(SwsVector *a){
