USB: convert drivers/usb/* to use module_usb_driver()

This converts the drivers in drivers/usb/* to use the
module_usb_driver() macro which makes the code smaller and a bit
simpler.

Added bonus is that it removes some unneeded kernel log messages about
drivers loading and/or unloading.

Cc: Simon Arlott <cxacru@fire.lp0.eu>
Cc: Duncan Sands <duncan.sands@free.fr>
Cc: Matthieu CASTET <castet.matthieu@free.fr>
Cc: Stanislaw Gruszka <stf_xl@wp.pl>
Cc: Pete Zaitcev <zaitcev@redhat.com>
Cc: Oliver Neukum <oliver@neukum.name>
Cc: Juergen Stuber <starblue@users.sourceforge.net>
Cc: Cesar Miquel <miquel@df.uba.ar>
Cc: Matthew Dharm <mdharm-usb@one-eyed-alien.net>
Cc: Matthew Wilcox <willy@linux.intel.com>
Cc: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Cc: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Cc: Felipe Balbi <balbi@ti.com>
Cc: Lucas De Marchi <lucas.demarchi@profusion.mobi>
Cc: Michael Hund <mhund@ld-didactic.de>
Cc: Zack Parsons <k3bacon@gmail.com>
Cc: Melchior FRANZ <mfranz@aon.at>
Cc: Tomoki Sekiyama <tomoki.sekiyama@gmail.com>
Cc: Dan Carpenter <error27@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/misc/adutux.c b/drivers/usb/misc/adutux.c
index fe85871..284b854 100644
--- a/drivers/usb/misc/adutux.c
+++ b/drivers/usb/misc/adutux.c
@@ -885,40 +885,7 @@
 	.id_table = device_table,
 };
 
-static int __init adu_init(void)
-{
-	int result;
-
-	dbg(2," %s : enter", __func__);
-
-	/* register this driver with the USB subsystem */
-	result = usb_register(&adu_driver);
-	if (result < 0) {
-		printk(KERN_ERR "usb_register failed for the "__FILE__
-		       " driver. Error number %d\n", result);
-		goto exit;
-	}
-
-	printk(KERN_INFO "adutux " DRIVER_DESC " " DRIVER_VERSION "\n");
-	printk(KERN_INFO "adutux is an experimental driver. "
-	       "Use at your own risk\n");
-
-exit:
-	dbg(2," %s : leave, return value %d", __func__, result);
-
-	return result;
-}
-
-static void __exit adu_exit(void)
-{
-	dbg(2," %s : enter", __func__);
-	/* deregister this driver with the USB subsystem */
-	usb_deregister(&adu_driver);
-	dbg(2," %s : leave", __func__);
-}
-
-module_init(adu_init);
-module_exit(adu_exit);
+module_usb_driver(adu_driver);
 
 MODULE_AUTHOR(DRIVER_AUTHOR);
 MODULE_DESCRIPTION(DRIVER_DESC);