MT#56750 Destroy the `port_pool.free_list_lock`

Destroy the `port_pool.free_list_lock` upon freeing
the interface's data in `interfaces_free()`.

Change-Id: I6a92cc2cf9ed62db71c1a42a44bab45bfdd25894

daemon/media_socket.c

@@ -3171,6 +3171,7 @@ void interfaces_free(void) {
 			g_hash_table_destroy(pp->free_ports_ht);
 		}
 		g_queue_clear(&pp->free_ports_q);
+		mutex_destroy(&pp->free_list_lock);
 		g_slice_free1(sizeof(*spec), spec);
 	}
 	g_list_free(ll);