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/ax25/af_ax25.c b/net/ax25/af_ax25.c
index f454607..f05306f 100644
--- a/net/ax25/af_ax25.c
+++ b/net/ax25/af_ax25.c
@@ -1961,7 +1961,7 @@
 
 #endif
 
-static struct net_proto_family ax25_family_ops = {
+static const struct net_proto_family ax25_family_ops = {
 	.family =	PF_AX25,
 	.create =	ax25_create,
 	.owner	=	THIS_MODULE,