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/key/af_key.c b/net/key/af_key.c
index 76fa6fe..4744b1f 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -3738,17 +3738,17 @@
 	return 0;
 }
 
-static void pfkey_exit_proc(struct net *net)
+static void __net_exit pfkey_exit_proc(struct net *net)
 {
 	proc_net_remove(net, "pfkey");
 }
 #else
-static int __net_init pfkey_init_proc(struct net *net)
+static inline int pfkey_init_proc(struct net *net)
 {
 	return 0;
 }
 
-static void pfkey_exit_proc(struct net *net)
+static inline void pfkey_exit_proc(struct net *net)
 {
 }
 #endif