[NETFILTER]: Fix incorrect argument to ip_nat_initialized() in ctnetlink

ip_nat_initialized() takes enum ip_nat_manip_type as it's second argument,
not a hook number.

Noticed and initial patch by Marcus Sundberg <marcus@ingate.com>.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/netfilter/ip_conntrack_netlink.c

@@ -877,7 +877,7 @@ ctnetlink_change_status(struct ip_conntrack *ct, struct nfattr *cda[])
 		DEBUGP("NAT status: %lu\n", 
 		       status & (IPS_NAT_MASK | IPS_NAT_DONE_MASK));
 		
-		if (ip_nat_initialized(ct, hooknum))
+		if (ip_nat_initialized(ct, HOOK2MANIP(hooknum)))
 			return -EEXIST;
 		ip_nat_setup_info(ct, &range, hooknum);