proper comment for loopback initialization order

Loopback device is special. It should be initialized at the very beginning. Initialization order has been changed by
Eric W. Biederman <[email protected]> and this change is non-obvious and important enough to add proper comment.

@@ -293,4 +293,6 @@ static int __init loopback_init(void)
 	return register_pernet_device(&loopback_net_ops);
 }
 
+/* Loopback is special. It should be initialized before any other network
+   device and network subsystem */
 fs_initcall(loopback_init);

From: "Denis V. Lunev" <[email protected]>
Date: Thu, 27 Sep 2007 16:25:27 +0400

Applied, but I had to fix the coding style of your comment, please do it like this in the future:

/* Loopback is special. It should be initialized before any other network
* device and network subsystem.
*/

Thanks.