bridge: netfilter: use PTR_RET instead of IS_ERR + PTR_ERR

This uses PTR_RET instead of IS_ERR and PTR_ERR in order to increase
readability.
Signed-off-by: NSilviu-Mihai Popescu <silviupopescu1990@gmail.com>
Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>

net/bridge/netfilter/ebtable_broute.c

@@ -64,9 +64,7 @@ static int ebt_broute(struct sk_buff *skb)
 static int __net_init broute_net_init(struct net *net)
 {
 	net->xt.broute_table = ebt_register_table(net, &broute_table);
-	if (IS_ERR(net->xt.broute_table))
-		return PTR_ERR(net->xt.broute_table);
-	return 0;
+	return PTR_RET(net->xt.broute_table);
 }
 
 static void __net_exit broute_net_exit(struct net *net)