net: Convert log pernet_operations

These pernet_operations use nf_log_set() and nf_log_unset()
in their methods:

	nf_log_bridge_net_ops
	nf_log_arp_net_ops
	nf_log_ipv4_net_ops
	nf_log_ipv6_net_ops
	nf_log_netdev_net_ops

Nobody can send such a packet to a net before it's became
registered, nobody can send a packet after all netdevices
are unregistered. So, these pernet_operations are able
to be marked as async.
Signed-off-by: NKirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/bridge/netfilter/nf_log_bridge.c

@@ -48,6 +48,7 @@ static void __net_exit nf_log_bridge_net_exit(struct net *net)
 static struct pernet_operations nf_log_bridge_net_ops = {
 	.init = nf_log_bridge_net_init,
 	.exit = nf_log_bridge_net_exit,
+	.async = true,
 };
 
 static int __init nf_log_bridge_init(void)

net/ipv4/netfilter/nf_log_arp.c

@@ -122,6 +122,7 @@ static void __net_exit nf_log_arp_net_exit(struct net *net)
 static struct pernet_operations nf_log_arp_net_ops = {
 	.init = nf_log_arp_net_init,
 	.exit = nf_log_arp_net_exit,
+	.async = true,
 };
 
 static int __init nf_log_arp_init(void)

net/ipv4/netfilter/nf_log_ipv4.c

@@ -358,6 +358,7 @@ static void __net_exit nf_log_ipv4_net_exit(struct net *net)
 static struct pernet_operations nf_log_ipv4_net_ops = {
 	.init = nf_log_ipv4_net_init,
 	.exit = nf_log_ipv4_net_exit,
+	.async = true,
 };
 
 static int __init nf_log_ipv4_init(void)

net/ipv6/netfilter/nf_log_ipv6.c

@@ -390,6 +390,7 @@ static void __net_exit nf_log_ipv6_net_exit(struct net *net)
 static struct pernet_operations nf_log_ipv6_net_ops = {
 	.init = nf_log_ipv6_net_init,
 	.exit = nf_log_ipv6_net_exit,
+	.async = true,
 };
 
 static int __init nf_log_ipv6_init(void)

net/netfilter/nf_log_netdev.c

@@ -47,6 +47,7 @@ static void __net_exit nf_log_netdev_net_exit(struct net *net)
 static struct pernet_operations nf_log_netdev_net_ops = {
 	.init = nf_log_netdev_net_init,
 	.exit = nf_log_netdev_net_exit,
+	.async = true,
 };
 
 static int __init nf_log_netdev_init(void)