cifs: Constify static struct genl_ops

The only usage of cifs_genl_ops[] is to assign its address to the ops
field in the genl_family struct, which is a pointer to const. Make it
const to allow the compiler to put it in read-only memory.
Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/cifs/netlink.c

@@ -30,7 +30,7 @@ static const struct nla_policy cifs_genl_policy[CIFS_GENL_ATTR_MAX + 1] = {
 	[CIFS_GENL_ATTR_SWN_RESOURCE_NAME]	= { .type = NLA_STRING},
 };
 
-static struct genl_ops cifs_genl_ops[] = {
+static const struct genl_ops cifs_genl_ops[] = {
 	{
 		.cmd = CIFS_GENL_CMD_SWN_NOTIFY,
 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,