[DECNET]: Fix initialization race.

Decnet exposes itself to proc and packets before it has finished initializing.
This was always a race, but the notifier replay might expose it worse.

net/decnet/af_decnet.c

@@ -2363,17 +2363,16 @@ static int __init decnet_init(void)
 	if (!dn_sk_cachep)
 		return -ENOMEM;
 
-	sock_register(&dn_family_ops);
-	dev_add_pack(&dn_dix_packet_type);
-	register_netdevice_notifier(&dn_dev_notifier);
-
-	proc_net_fops_create("decnet", S_IRUGO, &dn_socket_seq_fops);
-
 	dn_neigh_init();
 	dn_dev_init();
 	dn_route_init();
 	dn_fib_init();
 
+	sock_register(&dn_family_ops);
+	dev_add_pack(&dn_dix_packet_type);
+	register_netdevice_notifier(&dn_dev_notifier);
+
+	proc_net_fops_create("decnet", S_IRUGO, &dn_socket_seq_fops);
 	dn_register_sysctl();
 
 	return 0;