genetlink: make all genl_ops users const

Now that genl_ops are no longer modified in place when
registering, they can be made const. This patch was done
mostly with spatch:

@@
identifier ops;
@@
+const
 struct genl_ops ops[] = {
 ...
 };

(except the struct thing in net/openvswitch/datapath.c)

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/kernel/taskstats.c b/kernel/taskstats.c
index 609e77f..76595cd 100644
--- a/kernel/taskstats.c
+++ b/kernel/taskstats.c
@@ -673,7 +673,7 @@
 	nlmsg_free(rep_skb);
 }
 
-static struct genl_ops taskstats_ops[] = {
+static const struct genl_ops taskstats_ops[] = {
 	{
 		.cmd		= TASKSTATS_CMD_GET,
 		.doit		= taskstats_user_cmd,