USB: serial: moto_modem.c: use module_usb_serial_driver

This converts the moto_modem.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: Alan Stern <stern@rowland.harvard.edu>
CC: Elizabeth Jennifer Myers <elizabeth@sporksirc.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/serial/moto_modem.c

@@ -51,16 +51,5 @@ static struct usb_serial_driver * const serial_drivers[] = {
 	&moto_device, NULL
 };
 
-static int __init moto_init(void)
-{
-	return usb_serial_register_drivers(&moto_driver, serial_drivers);
-}
-
-static void __exit moto_exit(void)
-{
-	usb_serial_deregister_drivers(&moto_driver, serial_drivers);
-}
-
-module_init(moto_init);
-module_exit(moto_exit);
+module_usb_serial_driver(moto_driver, serial_drivers);
 MODULE_LICENSE("GPL");