Free the call->recording struct when the call is destroyed.

daemon/call.c

@@ -2223,6 +2223,7 @@ void call_destroy(struct call *c) {
 		free(c->recording->metadata);
 	}
 	meta_finish_file(c);
+	g_slice_free1(sizeof(*(c->recording)), c->recording);
 
 
 	rwlock_unlock_w(&c->master_lock);