[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/decnet/af_decnet.c b/net/decnet/af_decnet.c
index bfa910b..ed76d4a 100644
--- a/net/decnet/af_decnet.c
+++ b/net/decnet/af_decnet.c
@@ -2304,7 +2304,7 @@
 	return 0;
 }
 
-static struct seq_operations dn_socket_seq_ops = {
+static const struct seq_operations dn_socket_seq_ops = {
 	.start	= dn_socket_seq_start,
 	.next	= dn_socket_seq_next,
 	.stop	= dn_socket_seq_stop,