avfilter/vf_noise: Avoid using non public AV_PIX_FMT_NB

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

libavfilter/vf_noise.c

@@ -172,7 +172,7 @@ 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_PLANAR && !((desc->comp[0].depth_minus1 + 1) & 7))
             ff_add_format(&formats, fmt);