libavfilter/vf_unsharp.c:192: error: Null Dereference
  pointer `desc` last assigned on line 190 could be null and is dereferenced at line 192, column 21.

libavfilter/vf_unsharp.c:187:1: start of procedure config_props()
185. }
186. 
187. static int config_props(AVFilterLink *link)
     ^
188. {
189.     UnsharpContext *unsharp = link->dst->priv;

libavfilter/vf_unsharp.c:189:5: 
187. static int config_props(AVFilterLink *link)
188. {
189.     UnsharpContext *unsharp = link->dst->priv;
         ^
190.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
191. 

libavfilter/vf_unsharp.c:190:5: 
188. {
189.     UnsharpContext *unsharp = link->dst->priv;
190.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
         ^
191. 
192.     unsharp->hsub = desc->log2_chroma_w;

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)

libavfilter/vf_unsharp.c:192:5: 
190.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
191. 
192.     unsharp->hsub = desc->log2_chroma_w;
         ^
193.     unsharp->vsub = desc->log2_chroma_h;
194. 
