macosx/framework: VLCMediaListPlayer, don't leak the instance.

Sources/VLCMediaListPlayer.m

@@ -31,6 +31,7 @@
 
 - (void)dealloc
 {
+    libvlc_media_list_player_release(instance);
     [_mediaPlayer release];
     [_rootMedia release];
     [super dealloc];