USB: serial: opticon.c: use module_usb_serial_driver

This converts the opticon.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: Rusty Russell <rusty@rustcorp.com.au>
CC: Johan Hovold <jhovold@gmail.com>
CC: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
CC: Julia Lawall <julia@diku.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/serial/opticon.c

@@ -631,18 +631,8 @@ static struct usb_serial_driver * const serial_drivers[] = {
 	&opticon_device, NULL
 };
 
-static int __init opticon_init(void)
-{
-	return usb_serial_register_drivers(&opticon_driver, serial_drivers);
-}
-
-static void __exit opticon_exit(void)
-{
-	usb_serial_deregister_drivers(&opticon_driver, serial_drivers);
-}
+module_usb_serial_driver(opticon_driver, serial_drivers);
 
-module_init(opticon_init);
-module_exit(opticon_exit);
 MODULE_DESCRIPTION(DRIVER_DESC);
 MODULE_LICENSE("GPL");