rtpdec_h264: Use avpriv_report_missing_feature instead of a manual av_log

Signed-off-by: NMartin Storsjö <martin@martin.st>

libavformat/rtpdec_h264.c

@@ -351,9 +351,7 @@ static int h264_handle_packet(AVFormatContext *ctx, PayloadContext *data,
     case 26:                   // MTAP-16
     case 27:                   // MTAP-24
     case 29:                   // FU-B
-        av_log(ctx, AV_LOG_ERROR,
-               "Unhandled type (%d) (See RFC for implementation details)\n",
-               type);
+        avpriv_report_missing_feature(ctx, "RTP H.264 NAL unit type %d", type);
         result = AVERROR_PATCHWELCOME;
         break;