X25: Check for errors in x25_init

Adds error checking to x25_init.
Signed-off-by: NAndrew Hendry <andrew.hendry@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/x25/af_x25.c

@@ -1721,18 +1721,31 @@ static int __init x25_init(void)
 	if (rc != 0)
 		goto out;
 
-	sock_register(&x25_family_ops);
+	rc = sock_register(&x25_family_ops);
+	if (rc != 0)
+		goto out_proto;
 
 	dev_add_pack(&x25_packet_type);
 
-	register_netdevice_notifier(&x25_dev_notifier);
+	rc = register_netdevice_notifier(&x25_dev_notifier);
+	if (rc != 0)
+		goto out_sock;
 
 	printk(KERN_INFO "X.25 for Linux Version 0.2\n");
 
 	x25_register_sysctl();
-	x25_proc_init();
+	rc = x25_proc_init();
+	if (rc != 0)
+		goto out_dev;
 out:
 	return rc;
+out_dev:
+	unregister_netdevice_notifier(&x25_dev_notifier);
+out_sock:
+	sock_unregister(AF_X25);
+out_proto:
+	proto_unregister(&x25_proto);
+	goto out;
 }
 module_init(x25_init);