netfilter: netns: remove nf_*_net() wrappers

Now that dev_net() exists, the usefullness of them is even less. Also they're
a big problem in resolving circular header dependencies necessary for
NOTRACK-in-netns patch. See below.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
diff --git a/net/ipv4/netfilter/iptable_security.c b/net/ipv4/netfilter/iptable_security.c
index db6d312..36f3be3 100644
--- a/net/ipv4/netfilter/iptable_security.c
+++ b/net/ipv4/netfilter/iptable_security.c
@@ -73,7 +73,7 @@
 		  int (*okfn)(struct sk_buff *))
 {
 	return ipt_do_table(skb, hook, in, out,
-			    nf_local_in_net(in, out)->ipv4.iptable_security);
+			    dev_net(in)->ipv4.iptable_security);
 }
 
 static unsigned int
@@ -84,7 +84,7 @@
 		 int (*okfn)(struct sk_buff *))
 {
 	return ipt_do_table(skb, hook, in, out,
-			    nf_forward_net(in, out)->ipv4.iptable_security);
+			    dev_net(in)->ipv4.iptable_security);
 }
 
 static unsigned int
@@ -103,7 +103,7 @@
 		return NF_ACCEPT;
 	}
 	return ipt_do_table(skb, hook, in, out,
-			    nf_local_out_net(in, out)->ipv4.iptable_security);
+			    dev_net(out)->ipv4.iptable_security);
 }
 
 static struct nf_hook_ops ipt_ops[] __read_mostly = {