netfilter: ipt_CLUSTERIP: make symbol 'cip_netdev_notifier' static

Fixes the following sparse warnings:

net/ipv4/netfilter/ipt_CLUSTERIP.c:867:23: warning:
 symbol 'cip_netdev_notifier' was not declared. Should it be static?

Fixes: 5a86d68b ("netfilter: ipt_CLUSTERIP: fix deadlock in netns exit routine")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/ipv4/netfilter/ipt_CLUSTERIP.c

@@ -864,7 +864,7 @@ static struct pernet_operations clusterip_net_ops = {
 	.size = sizeof(struct clusterip_net),
 };
 
-struct notifier_block cip_netdev_notifier = {
+static struct notifier_block cip_netdev_notifier = {
 	.notifier_call = clusterip_netdev_event
 };