netfilter: nf_nat: use PTR_RET

Use PTR_RET rather than if(IS_ERR(...)) + PTR_ERR

Generated by: coccinelle/api/ptr_ret.cocci
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/ipv4/netfilter/iptable_nat.c

@@ -274,9 +274,7 @@ static int __net_init iptable_nat_net_init(struct net *net)
 		return -ENOMEM;
 	net->ipv4.nat_table = ipt_register_table(net, &nf_nat_ipv4_table, repl);
 	kfree(repl);
-	if (IS_ERR(net->ipv4.nat_table))
-		return PTR_ERR(net->ipv4.nat_table);
-	return 0;
+	return PTR_RET(net->ipv4.nat_table);
 }
 
 static void __net_exit iptable_nat_net_exit(struct net *net)

net/ipv6/netfilter/ip6table_nat.c

@@ -275,9 +275,7 @@ static int __net_init ip6table_nat_net_init(struct net *net)
 		return -ENOMEM;
 	net->ipv6.ip6table_nat = ip6t_register_table(net, &nf_nat_ipv6_table, repl);
 	kfree(repl);
-	if (IS_ERR(net->ipv6.ip6table_nat))
-		return PTR_ERR(net->ipv6.ip6table_nat);
-	return 0;
+	return PTR_RET(net->ipv6.ip6table_nat);
 }
 
 static void __net_exit ip6table_nat_net_exit(struct net *net)