avformat/demux: Don't free inexistent ID3v2 metadata

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavformat/demux.c

@@ -319,8 +319,8 @@ int avformat_open_input(AVFormatContext **ps, const char *filename,
                 goto close;
         } else
             av_log(s, AV_LOG_DEBUG, "demuxer does not support additional id3 data, skipping\n");
+        ff_id3v2_free_extra_meta(&id3v2_extra_meta);
     }
-    ff_id3v2_free_extra_meta(&id3v2_extra_meta);
 
     if ((ret = avformat_queue_attached_pictures(s)) < 0)
         goto close;