USB: serial: usb_debug.c: use module_usb_serial_driver

This converts the usb_debug.c driver to use the module_usb_serial_driver() call
instead of having to have a module_init/module_exit function, saving a lot
of duplicated code.

CC: Johan Hovold <jhovold@gmail.com>
CC: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/serial/usb_debug.c

@@ -83,16 +83,5 @@ static struct usb_serial_driver * const serial_drivers[] = {
 	&debug_device, NULL
 };
 
-static int __init debug_init(void)
-{
-	return usb_serial_register_drivers(&debug_driver, serial_drivers);
-}
-
-static void __exit debug_exit(void)
-{
-	usb_serial_deregister_drivers(&debug_driver, serial_drivers);
-}
-
-module_init(debug_init);
-module_exit(debug_exit);
+module_usb_serial_driver(debug_driver, serial_drivers);
 MODULE_LICENSE("GPL");