[Fix] Revisited the libvorbis fix. We wish to return 0 on close.

src/music.c

@@ -47,10 +47,11 @@ static size_t ovpack_read(void* ptr, size_t size, size_t nmemb, void* datasource
 }
 
 static int ovpack_retneg(void) { return -1; } // Must return -1.
+static int ovpack_retzero(void) { return 0; } // Must return 0.
 ov_callbacks ovcall = {
 	.read_func 	= ovpack_read,
 	.seek_func 	= (int(*)(void*, ogg_int64_t, int)) ovpack_retneg,
-	.close_func	= NULL,
+	.close_func	= (int(*)(void*))ovpack_retzero,
 	.tell_func	= (long(*)(void*))ovpack_retneg
 };