openvswitch: Replace removed NF_NAT_NEEDED with IS_ENABLED(CONFIG_NF_NAT)

Commit 4806e975 ("netfilter: replace NF_NAT_NEEDED with
IS_ENABLED(CONFIG_NF_NAT)") removed CONFIG_NF_NAT_NEEDED, but a new user
popped up afterwards.

Fixes: fec9c271 ("openvswitch: load and reference the NAT helper.")
Signed-off-by: NGeert Uytterhoeven <geert@linux-m68k.org>
Acked-by: NFlorian Westphal <fw@strlen.de>
Acked-by: NFlavio Leitner <fbl@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/openvswitch/conntrack.c

@@ -1322,7 +1322,7 @@ static int ovs_ct_add_helper(struct ovs_conntrack_info *info, const char *name,
 		return -ENOMEM;
 	}
 
-#ifdef CONFIG_NF_NAT_NEEDED
+#if IS_ENABLED(CONFIG_NF_NAT)
 	if (info->nat) {
 		ret = nf_nat_helper_try_module_get(name, info->family,
 						   key->ip.proto);
@@ -1811,7 +1811,7 @@ void ovs_ct_free_action(const struct nlattr *a)
 static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info)
 {
 	if (ct_info->helper) {
-#ifdef CONFIG_NF_NAT_NEEDED
+#if IS_ENABLED(CONFIG_NF_NAT)
 		if (ct_info->nat)
 			nf_nat_helper_put(ct_info->helper);
 #endif