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/xfrm/xfrm_sysctl.c b/net/xfrm/xfrm_sysctl.c
index 2e221f2..2c4d6cd 100644
--- a/net/xfrm/xfrm_sysctl.c
+++ b/net/xfrm/xfrm_sysctl.c
@@ -2,7 +2,7 @@
 #include <net/net_namespace.h>
 #include <net/xfrm.h>
 
-static void __xfrm_sysctl_init(struct net *net)
+static void __net_init __xfrm_sysctl_init(struct net *net)
 {
 	net->xfrm.sysctl_aevent_etime = XFRM_AE_ETIME;
 	net->xfrm.sysctl_aevent_rseqth = XFRM_AE_SEQT_SIZE;
@@ -64,7 +64,7 @@
 	return -ENOMEM;
 }
 
-void xfrm_sysctl_fini(struct net *net)
+void __net_exit xfrm_sysctl_fini(struct net *net)
 {
 	struct ctl_table *table;