net: make neigh_ops constant

These tables are never modified at runtime. Move to read-only
section.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/atm/clip.c b/net/atm/clip.c
index 27f6852..64629c3 100644
--- a/net/atm/clip.c
+++ b/net/atm/clip.c
@@ -267,7 +267,7 @@
 	kfree_skb(skb);
 }
 
-static struct neigh_ops clip_neigh_ops = {
+static const struct neigh_ops clip_neigh_ops = {
 	.family =		AF_INET,
 	.solicit =		clip_neigh_solicit,
 	.error_report =		clip_neigh_error,