MT#55283 fix async reference leak

Change-Id: Ie8cc5e6f46712b5f7d10fdea044bfafca061c908

lib/codeclib.c

@@ -5473,7 +5473,7 @@ void codec_cc_free(codec_cc_t **ccp) {
 
 	{
 		LOCK(&c->async_lock);
-		if (c->async_busy) {
+		if (c->async_busy && !c->async_blocked) {
 			c->async_shutdown = true;
 			return; // wait for callback
 		}