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/unix/sysctl_net_unix.c b/net/unix/sysctl_net_unix.c
index 708f5df..d095c7b 100644
--- a/net/unix/sysctl_net_unix.c
+++ b/net/unix/sysctl_net_unix.c
@@ -31,7 +31,7 @@
 	{ },
 };
 
-int unix_sysctl_register(struct net *net)
+int __net_init unix_sysctl_register(struct net *net)
 {
 	struct ctl_table *table;