netfilter: nf_hook_ops structs can be const

We no longer place these on a list so they can be const.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
diff --git a/drivers/net/ipvlan/ipvlan_main.c b/drivers/net/ipvlan/ipvlan_main.c
index fdde207..943e690 100644
--- a/drivers/net/ipvlan/ipvlan_main.c
+++ b/drivers/net/ipvlan/ipvlan_main.c
@@ -15,7 +15,7 @@ struct ipvlan_netns {
 	unsigned int ipvl_nf_hook_refcnt;
 };
 
-static struct nf_hook_ops ipvl_nfops[] __read_mostly = {
+static const struct nf_hook_ops ipvl_nfops[] = {
 	{
 		.hook     = ipvlan_nf_input,
 		.pf       = NFPROTO_IPV4,