net: mark net_proto_ops as const

All usages of structure net_proto_ops should be declared const.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 19e9800..0cd2d88 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -2050,7 +2050,7 @@
 	.sendpage =	sock_no_sendpage,
 };
 
-static struct net_proto_family netlink_family_ops = {
+static const struct net_proto_family netlink_family_ops = {
 	.family = PF_NETLINK,
 	.create = netlink_create,
 	.owner	= THIS_MODULE,	/* for consistency 8) */