usb: appledisplay: use module_usb_driver to simplify the code

module_usb_driver() makes the code simpler by eliminating
boilerplate code.
Signed-off-by: Liu Shixin <liushixin2@huawei.com>
Link: https://lore.kernel.org/r/20200918031012.3980558-1-liushixin2@huawei.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/misc/appledisplay.c

@@ -342,20 +342,8 @@ static struct usb_driver appledisplay_driver = {
 	.disconnect	= appledisplay_disconnect,
 	.id_table	= appledisplay_table,
 };
-
-static int __init appledisplay_init(void)
-{
-	return usb_register(&appledisplay_driver);
-}
-
-static void __exit appledisplay_exit(void)
-{
-	usb_deregister(&appledisplay_driver);
-}
+module_usb_driver(appledisplay_driver);
 
 MODULE_AUTHOR("Michael Hanselmann");
 MODULE_DESCRIPTION("Apple Cinema Display driver");
 MODULE_LICENSE("GPL");
-
-module_init(appledisplay_init);
-module_exit(appledisplay_exit);