drivers/rtc/rtc-rx4581.c: remove empty function

After the switch to devm_* functions and the removal of
rtc_device_unregister(), the 'remove' function does not do anything.
Delete it.

Signed-off-by: Sachin Kamat <[e-mail]>
Cc: Torben Hohn <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/rtc/rtc-rx4581.c

···
 	return 0;
 }
 
-static int rx4581_remove(struct spi_device *spi)
-{
-	return 0;
-}
-
 static const struct spi_device_id rx4581_id[] = {
 	{ "rx4581", 0 },
 	{ }
···
 		.owner	= THIS_MODULE,
 	},
 	.probe	= rx4581_probe,
-	.remove = rx4581_remove,
 	.id_table = rx4581_id,
 };