avoid infinite loop at the end of files which are not properly terminated

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@10857 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavformat/electronicarts.c

@@ -335,6 +335,7 @@ static int ea_read_packet(AVFormatContext *s,
             break;
 
         /* ending tag */
+        case 0:
         case SCEl_TAG:
             ret = AVERROR(EIO);
             packet_read = 1;