libswscale/swscale.c:72: error: Null Dereference
  pointer `desc` last assigned on line 68 could be null and is dereferenced at line 72, column 27.

libswscale/swscale.c:64:1: start of procedure hScale16To19_c()
62. }
63. 
64. static void hScale16To19_c(SwsContext *c, int16_t *_dst, int dstW,
    ^
65.                            const uint8_t *_src, const int16_t *filter,
66.                            const int32_t *filterPos, int filterSize)

libswscale/swscale.c:68:5: 
66.                            const int32_t *filterPos, int filterSize)
67. {
68.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(c->srcFormat);
        ^
69.     int i;
70.     int32_t *dst        = (int32_t *) _dst;

libavutil/pixdesc.c:1199:1: start of procedure av_pix_fmt_desc_get()
  1197. }
  1198. 
  1199. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
        ^
  1200. {
  1201.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)

libavutil/pixdesc.c:1201:9: Taking false branch
  1199. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
  1200. {
  1201.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
                ^
  1202.         return NULL;
  1203.     return &av_pix_fmt_descriptors[pix_fmt];

libavutil/pixdesc.c:1201:24: Taking true branch
  1199. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
  1200. {
  1201.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
                               ^
  1202.         return NULL;
  1203.     return &av_pix_fmt_descriptors[pix_fmt];

libavutil/pixdesc.c:1202:9: 
  1200. {
  1201.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
  1202.         return NULL;
                ^
  1203.     return &av_pix_fmt_descriptors[pix_fmt];
  1204. }

libavutil/pixdesc.c:1204:1: return from a call to av_pix_fmt_desc_get
  1202.         return NULL;
  1203.     return &av_pix_fmt_descriptors[pix_fmt];
  1204. }
        ^
  1205. 
  1206. const AVPixFmtDescriptor *av_pix_fmt_desc_next(const AVPixFmtDescriptor *prev)

libswscale/swscale.c:70:5: 
68.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(c->srcFormat);
69.     int i;
70.     int32_t *dst        = (int32_t *) _dst;
        ^
71.     const uint16_t *src = (const uint16_t *) _src;
72.     int bits            = desc->comp[0].depth_minus1;

libswscale/swscale.c:71:5: 
69.     int i;
70.     int32_t *dst        = (int32_t *) _dst;
71.     const uint16_t *src = (const uint16_t *) _src;
        ^
72.     int bits            = desc->comp[0].depth_minus1;
73.     int sh              = bits - 4;

libswscale/swscale.c:72:5: 
70.     int32_t *dst        = (int32_t *) _dst;
71.     const uint16_t *src = (const uint16_t *) _src;
72.     int bits            = desc->comp[0].depth_minus1;
        ^
73.     int sh              = bits - 4;
74. 
