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/bridge/br_if.c b/net/bridge/br_if.c
index a2cbe61..7bc06040 100644
--- a/net/bridge/br_if.c
+++ b/net/bridge/br_if.c
@@ -467,7 +467,7 @@
 	return 0;
 }
 
-void br_net_exit(struct net *net)
+void __net_exit br_net_exit(struct net *net)
 {
 	struct net_device *dev;
 	LIST_HEAD(list);