Merge commit '30015305'

* commit '30015305':
  Use avpriv_request_sample() where appropriate

Only the roqvideo chunk is merged because we actually support 24bpp
flic, see 5781c983.
Merged-by: Clément Bœsch <u@pkh.me>

libavcodec/roqvideodec.c

@@ -175,8 +175,7 @@ static av_cold int roq_decode_init(AVCodecContext *avctx)
     s->avctx = avctx;
 
     if (avctx->width % 16 || avctx->height % 16) {
-        av_log(avctx, AV_LOG_ERROR,
-               "Dimensions must be a multiple of 16\n");
+        avpriv_request_sample(avctx, "Dimensions not being a multiple of 16");
         return AVERROR_PATCHWELCOME;
     }