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/route.c b/net/ipv6/route.c
index c2bd74c..8500156 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -2612,7 +2612,7 @@
 	{ }
 };
 
-struct ctl_table *ipv6_route_sysctl_init(struct net *net)
+struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
 {
 	struct ctl_table *table;
 
@@ -2637,7 +2637,7 @@
 }
 #endif
 
-static int ip6_route_net_init(struct net *net)
+static int __net_init ip6_route_net_init(struct net *net)
 {
 	int ret = -ENOMEM;
 
@@ -2702,7 +2702,7 @@
 	goto out;
 }
 
-static void ip6_route_net_exit(struct net *net)
+static void __net_exit ip6_route_net_exit(struct net *net)
 {
 #ifdef CONFIG_PROC_FS
 	proc_net_remove(net, "ipv6_route");