usb: core: Use module_led_trigger macro to simplify the code

Use the module_led_trigger macro to simplify the code, which is the
same as declaring with module_init() and module_exit().

Signed-off-by: Li Zetao <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/core/ledtrig-usbport.c

···
 	.deactivate = usbport_trig_deactivate,
 };
 
-static int __init usbport_trig_init(void)
-{
-	return led_trigger_register(&usbport_led_trigger);
-}
-
-static void __exit usbport_trig_exit(void)
-{
-	led_trigger_unregister(&usbport_led_trigger);
-}
-
-module_init(usbport_trig_init);
-module_exit(usbport_trig_exit);
+module_led_trigger(usbport_led_trigger);
 
 MODULE_AUTHOR("Rafał Miłecki <[e-mail]>");
 MODULE_DESCRIPTION("USB port trigger");