libavcodec/utils.c:286: error: Null Dereference
  pointer `desc` last assigned on line 285 could be null and is dereferenced at line 286, column 24.

libavcodec/utils.c:283:1: start of procedure avcodec_align_dimensions()
281. }
282. 
283. void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height)
     ^
284. {
285.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(s->pix_fmt);

libavcodec/utils.c:285:5: 
283. void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height)
284. {
285.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(s->pix_fmt);
         ^
286.     int chroma_shift = desc->log2_chroma_w;
287.     int linesize_align[AV_NUM_DATA_POINTERS];

libavutil/pixdesc.c:1689:1: start of procedure av_pix_fmt_desc_get()
  1687. }
  1688. 
  1689. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
        ^
  1690. {
  1691.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)

libavutil/pixdesc.c:1691:9: Taking false branch
  1689. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
  1690. {
  1691.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
                ^
  1692.         return NULL;
  1693.     return &av_pix_fmt_descriptors[pix_fmt];

libavutil/pixdesc.c:1691:24: Taking true branch
  1689. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
  1690. {
  1691.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
                               ^
  1692.         return NULL;
  1693.     return &av_pix_fmt_descriptors[pix_fmt];

libavutil/pixdesc.c:1692:9: 
  1690. {
  1691.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
  1692.         return NULL;
                ^
  1693.     return &av_pix_fmt_descriptors[pix_fmt];
  1694. }

libavutil/pixdesc.c:1694:1: return from a call to av_pix_fmt_desc_get
  1692.         return NULL;
  1693.     return &av_pix_fmt_descriptors[pix_fmt];
  1694. }
        ^
  1695. 
  1696. const AVPixFmtDescriptor *av_pix_fmt_desc_next(const AVPixFmtDescriptor *prev)

libavcodec/utils.c:286:5: 
284. {
285.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(s->pix_fmt);
286.     int chroma_shift = desc->log2_chroma_w;
         ^
287.     int linesize_align[AV_NUM_DATA_POINTERS];
288.     int align;
