net: spread __net_init, __net_exit

__net_init/__net_exit are apparently not going away, so use them
to full extent.

In some cases __net_init was removed, because it was called from
__net_exit code.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/proc.c b/net/ipv6/proc.c
index 7b197b7..02f2001 100644
--- a/net/ipv6/proc.c
+++ b/net/ipv6/proc.c
@@ -267,7 +267,7 @@
 	return 0;
 }
 
-static int ipv6_proc_init_net(struct net *net)
+static int __net_init ipv6_proc_init_net(struct net *net)
 {
 	if (!proc_net_fops_create(net, "sockstat6", S_IRUGO,
 			&sockstat6_seq_fops))
@@ -288,7 +288,7 @@
 	return -ENOMEM;
 }
 
-static void ipv6_proc_exit_net(struct net *net)
+static void __net_exit ipv6_proc_exit_net(struct net *net)
 {
 	proc_net_remove(net, "sockstat6");
 	proc_net_remove(net, "dev_snmp6");