libavcodec/utils.c:291: error: Null Dereference
  pointer `desc` last assigned on line 290 could be null and is dereferenced at line 291, column 24.

libavcodec/utils.c:288:1: start of procedure avcodec_align_dimensions()
286. }
287. 
288. void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height)
     ^
289. {
290.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(s->pix_fmt);

libavcodec/utils.c:290:5: 
288. void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height)
289. {
290.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(s->pix_fmt);
         ^
291.     int chroma_shift = desc->log2_chroma_w;
292.     int linesize_align[AV_NUM_DATA_POINTERS];

libavutil/pixdesc.c:1914:1: start of procedure av_pix_fmt_desc_get()
  1912. }
  1913. 
  1914. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
        ^
  1915. {
  1916.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)

libavutil/pixdesc.c:1916:9: Taking false branch
  1914. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
  1915. {
  1916.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
                ^
  1917.         return NULL;
  1918.     return &av_pix_fmt_descriptors[pix_fmt];

libavutil/pixdesc.c:1916:24: Taking true branch
  1914. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
  1915. {
  1916.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
                               ^
  1917.         return NULL;
  1918.     return &av_pix_fmt_descriptors[pix_fmt];

libavutil/pixdesc.c:1917:9: 
  1915. {
  1916.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
  1917.         return NULL;
                ^
  1918.     return &av_pix_fmt_descriptors[pix_fmt];
  1919. }

libavutil/pixdesc.c:1919:1: return from a call to av_pix_fmt_desc_get
  1917.         return NULL;
  1918.     return &av_pix_fmt_descriptors[pix_fmt];
  1919. }
        ^
  1920. 
  1921. const AVPixFmtDescriptor *av_pix_fmt_desc_next(const AVPixFmtDescriptor *prev)

libavcodec/utils.c:291:5: 
289. {
290.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(s->pix_fmt);
291.     int chroma_shift = desc->log2_chroma_w;
         ^
292.     int linesize_align[AV_NUM_DATA_POINTERS];
293.     int align;
