matroskadec: return AVERROR_EOF upon detection of end of file

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@17460 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavformat/matroskadec.c

@@ -1761,7 +1761,7 @@ static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
 
     while (matroska_deliver_packet(matroska, pkt)) {
         if (matroska->done)
-            return AVERROR(EIO);
+            return AVERROR_EOF;
         matroska_parse_cluster(matroska);
     }