matroskadec: remove useless initialization

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@14576 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavformat/matroskadec.c

@@ -1928,7 +1928,7 @@ matroska_read_close (AVFormatContext *s)
 {
     MatroskaDemuxContext *matroska = s->priv_data;
     MatroskaTrack *tracks = matroska->tracks.elem;
-    int n = 0;
+    int n;
 
     matroska_clear_queue(matroska);