leds: nic78bx: Use devm API to cleanup module's resources

In this driver LEDs are registered using devm_led_classdev_register()
so they are automatically unregistered after module's remove() is done.
led_classdev_unregister() calls module's led_set_brightness() to turn off
the LEDs and that callback uses resources which were destroyed already
in module's remove() so use devm API instead of remove().

Signed-off-by: George Stark <[e-mail]>
Reviewed-by: Andy Shevchenko <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Lee Jones <[e-mail]>

drivers/leds/leds-nic78bx.c

···
 	}
 };
 
+static void lock_led_reg_action(void *data)
+{
+	struct nic78bx_led_data *led_data = data;
+
+	/* Lock LED register */
+	outb(NIC78BX_LOCK_VALUE,
+	     led_data->io_base + NIC78BX_LOCK_REG_OFFSET);
+}
+
 static int nic78bx_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
···
 	led_data->io_base = io_rc->start;
 	spin_lock_init(&led_data->lock);
 
+	ret = devm_add_action(dev, lock_led_reg_action, led_data);
+	if (ret)
+		return ret;
+
 	for (i = 0; i < ARRAY_SIZE(nic78bx_leds); i++) {
 		nic78bx_leds[i].data = led_data;
 
···
 	return ret;
 }
 
-static void nic78bx_remove(struct platform_device *pdev)
-{
-	struct nic78bx_led_data *led_data = platform_get_drvdata(pdev);
-
-	/* Lock LED register */
-	outb(NIC78BX_LOCK_VALUE,
-	     led_data->io_base + NIC78BX_LOCK_REG_OFFSET);
-}
-
 static const struct acpi_device_id led_device_ids[] = {
 	{"NIC78B3", 0},
 	{"", 0},
···
 
 static struct platform_driver led_driver = {
 	.probe = nic78bx_probe,
-	.remove_new = nic78bx_remove,
 	.driver = {
 		.name = KBUILD_MODNAME,
 		.acpi_match_table = ACPI_PTR(led_device_ids),