net: constify remaining proto_ops

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/rds/af_rds.c b/net/rds/af_rds.c
index 108ed2e..6b58aef 100644
--- a/net/rds/af_rds.c
+++ b/net/rds/af_rds.c
@@ -359,7 +359,7 @@
 	.obj_size = sizeof(struct rds_sock),
 };
 
-static struct proto_ops rds_proto_ops = {
+static const struct proto_ops rds_proto_ops = {
 	.family =	AF_RDS,
 	.owner =	THIS_MODULE,
 	.release =	rds_release,