libswscale/swscale.c:95: error: Null Dereference
  pointer `desc` last assigned on line 92 could be null and is dereferenced at line 95, column 27.

libswscale/swscale.c:88:1: start of procedure hScale16To15_c()
86. }
87. 
88. static void hScale16To15_c(SwsContext *c, int16_t *dst, int dstW,
    ^
89.                            const uint8_t *_src, const int16_t *filter,
90.                            const int32_t *filterPos, int filterSize)

libswscale/swscale.c:92:5: 
90.                            const int32_t *filterPos, int filterSize)
91. {
92.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(c->srcFormat);
        ^
93.     int i;
94.     const uint16_t *src = (const uint16_t *) _src;

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:94:5: 
92.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(c->srcFormat);
93.     int i;
94.     const uint16_t *src = (const uint16_t *) _src;
        ^
95.     int sh              = desc->comp[0].depth_minus1;
96. 

libswscale/swscale.c:95:5: 
93.     int i;
94.     const uint16_t *src = (const uint16_t *) _src;
95.     int sh              = desc->comp[0].depth_minus1;
        ^
96. 
97.     for (i = 0; i < dstW; i++) {
