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/packet/af_packet.c b/net/packet/af_packet.c
index efc1174..70073a0 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -2399,7 +2399,7 @@
 	.sendpage =	sock_no_sendpage,
 };
 
-static struct net_proto_family packet_family_ops = {
+static const struct net_proto_family packet_family_ops = {
 	.family =	PF_PACKET,
 	.create =	packet_create,
 	.owner	=	THIS_MODULE,