Silence following warning if only zeros were not consumed:

AVC: Consumed only m bytes instead of n

Originally committed as revision 17327 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/h264.c

@@ -7418,7 +7418,11 @@ static int decode_nal_units(H264Context *h, const uint8_t *buf, int buf_size){
         }
 
         if (h->is_avc && (nalsize != consumed)){
-            av_log(h->s.avctx, AV_LOG_ERROR, "AVC: Consumed only %d bytes instead of %d\n", consumed, nalsize);
+            int i, debug_level = AV_LOG_DEBUG;
+            for (i = consumed; i < nalsize; i++)
+                if (buf[buf_index+i])
+                    debug_level = AV_LOG_ERROR;
+            av_log(h->s.avctx, debug_level, "AVC: Consumed only %d bytes instead of %d\n", consumed, nalsize);
             consumed= nalsize;
         }