tipc: fix error handling in tipc_udp_enable()

Release alloced resource before return from the error handling
case in tipc_udp_enable(), otherwise will cause memory leak.

Fixes: 52dfae5c85 ("tipc: obtain node identity from interface by default")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Acked-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/tipc/udp_media.c

@@ -687,7 +687,8 @@ static int tipc_udp_enable(struct net *net, struct tipc_bearer *b,
 	}
 	if (!tipc_own_id(net)) {
 		pr_warn("Failed to set node id, please configure manually\n");
-		return -EINVAL;
+		err = -EINVAL;
+		goto err;
 	}
 
 	b->bcast_addr.media_id = TIPC_MEDIA_TYPE_UDP;