libavcodec/utils.c:732: error: Null Dereference
  pointer `desc` last assigned on line 731 could be null and is dereferenced at line 732, column 12.

libavcodec/utils.c:729:1: start of procedure is_hwaccel_pix_fmt()
727. }
728. 
729. static int is_hwaccel_pix_fmt(enum AVPixelFormat pix_fmt)
     ^
730. {
731.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);

libavcodec/utils.c:731:5: 
729. static int is_hwaccel_pix_fmt(enum AVPixelFormat pix_fmt)
730. {
731.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
         ^
732.     return desc->flags & AV_PIX_FMT_FLAG_HWACCEL;
733. }

libavutil/pixdesc.c:1892:1: start of procedure av_pix_fmt_desc_get()
  1890. }
  1891. 
  1892. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
        ^
  1893. {
  1894.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)

libavutil/pixdesc.c:1894:9: Taking false branch
  1892. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
  1893. {
  1894.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
                ^
  1895.         return NULL;
  1896.     return &av_pix_fmt_descriptors[pix_fmt];

libavutil/pixdesc.c:1894:24: Taking true branch
  1892. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
  1893. {
  1894.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
                               ^
  1895.         return NULL;
  1896.     return &av_pix_fmt_descriptors[pix_fmt];

libavutil/pixdesc.c:1895:9: 
  1893. {
  1894.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
  1895.         return NULL;
                ^
  1896.     return &av_pix_fmt_descriptors[pix_fmt];
  1897. }

libavutil/pixdesc.c:1897:1: return from a call to av_pix_fmt_desc_get
  1895.         return NULL;
  1896.     return &av_pix_fmt_descriptors[pix_fmt];
  1897. }
        ^
  1898. 
  1899. const AVPixFmtDescriptor *av_pix_fmt_desc_next(const AVPixFmtDescriptor *prev)

libavcodec/utils.c:732:5: 
730. {
731.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
732.     return desc->flags & AV_PIX_FMT_FLAG_HWACCEL;
         ^
733. }
734. 
