USB: serial: navman.c: use module_usb_serial_driver

This converts the navman.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: Alan Stern <stern@rowland.harvard.edu>
CC: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/serial/navman.c

@@ -132,18 +132,8 @@ static struct usb_serial_driver * const serial_drivers[] = {
 	&navman_device, NULL
 };
 
-static int __init navman_init(void)
-{
-	return usb_serial_register_drivers(&navman_driver, serial_drivers);
-}
-
-static void __exit navman_exit(void)
-{
-	usb_serial_deregister_drivers(&navman_driver, serial_drivers);
-}
+module_usb_serial_driver(navman_driver, serial_drivers);
 
-module_init(navman_init);
-module_exit(navman_exit);
 MODULE_LICENSE("GPL");
 
 module_param(debug, bool, S_IRUGO | S_IWUSR);