[IPSEC]: Kill afinfo->nf_post_routing

After changeset:

	[NETFILTER]: Introduce NF_INET_ hook values

It always evaluates to NF_INET_POST_ROUTING.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/xfrm/xfrm_output.c b/net/xfrm/xfrm_output.c
index 048d240..3c277a4 100644
--- a/net/xfrm/xfrm_output.c
+++ b/net/xfrm/xfrm_output.c
@@ -113,7 +113,7 @@
 			return dst_output(skb);
 
 		err = nf_hook(x->inner_mode->afinfo->family,
-			      x->inner_mode->afinfo->nf_post_routing, skb,
+			      NF_INET_POST_ROUTING, skb,
 			      NULL, skb->dst->dev, xfrm_output2);
 		if (unlikely(err != 1))
 			goto out;