[NET]: Make all initialized struct seq_operations const.

Make all initialized struct seq_operations in net/ const

Signed-off-by: Philippe De Muyter <phdm@macqel.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/netfilter/xt_hashlimit.c b/net/netfilter/xt_hashlimit.c
index 5a6ea9b..d6b3d01 100644
--- a/net/netfilter/xt_hashlimit.c
+++ b/net/netfilter/xt_hashlimit.c
@@ -701,7 +701,7 @@
 	return 0;
 }
 
-static struct seq_operations dl_seq_ops = {
+static const struct seq_operations dl_seq_ops = {
 	.start = dl_seq_start,
 	.next  = dl_seq_next,
 	.stop  = dl_seq_stop,