Make g729dec.c:decode_frame() return AVERROR_INVALIDDATA rather than

AVERROR_NOFMT in case of invalid / unknown packet size.

Originally committed as revision 22624 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/g729dec.c

@@ -224,7 +224,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
         av_log(avctx, AV_LOG_DEBUG, "Packet type: %s\n", "G.729D @ 6.4kbit/s");
     } else {
         av_log(avctx, AV_LOG_ERROR, "Packet size %d is unknown.\n", buf_size);
-        return (AVERROR_NOFMT);
+        return AVERROR_INVALIDDATA;
     }
 
     for (i=0; i < buf_size; i++)