avfilter/crop: Avoid using non public AV_PIX_FMT_NB

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavfilter/vf_crop.c

@@ -95,7 +95,7 @@ static int query_formats(AVFilterContext *ctx)
     AVFilterFormats *formats = NULL;
     int fmt;
 
-    for (fmt = 0; fmt < AV_PIX_FMT_NB; fmt++) {
+    for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
         if (!(desc->flags & (AV_PIX_FMT_FLAG_HWACCEL | AV_PIX_FMT_FLAG_BITSTREAM)) &&
             !((desc->log2_chroma_w || desc->log2_chroma_h) && !(desc->flags & AV_PIX_FMT_FLAG_PLANAR)))