power: supply: wm831x: Use devm_power_supply_register() helper

Use the device lifecycle managed register function. This helps prevent
mistakes like unregistering out of order in cleanup functions and
forgetting to unregister on error paths.

Signed-off-by: Andrew Davis <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Sebastian Reichel <[e-mail]>

drivers/power/supply/wm831x_power.c

···
 	power->wall_desc.properties = wm831x_wall_props;
 	power->wall_desc.num_properties = ARRAY_SIZE(wm831x_wall_props);
 	power->wall_desc.get_property = wm831x_wall_get_prop;
-	power->wall = power_supply_register(&pdev->dev, &power->wall_desc,
-					    NULL);
+	power->wall = devm_power_supply_register(&pdev->dev,
+						 &power->wall_desc,
+						 NULL);
 	if (IS_ERR(power->wall)) {
 		ret = PTR_ERR(power->wall);
 		goto err;
···
 	power->usb_desc.properties = wm831x_usb_props;
 	power->usb_desc.num_properties = ARRAY_SIZE(wm831x_usb_props);
 	power->usb_desc.get_property = wm831x_usb_get_prop;
-	power->usb = power_supply_register(&pdev->dev, &power->usb_desc, NULL);
+	power->usb = devm_power_supply_register(&pdev->dev,
+						&power->usb_desc,
+						NULL);
 	if (IS_ERR(power->usb)) {
 		ret = PTR_ERR(power->usb);
 		goto err_wall;
···
 		power->battery_desc.num_properties = ARRAY_SIZE(wm831x_bat_props);
 		power->battery_desc.get_property = wm831x_bat_get_prop;
 		power->battery_desc.use_for_apm = 1;
-		power->battery = power_supply_register(&pdev->dev,
-						       &power->battery_desc,
-						       NULL);
+		power->battery = devm_power_supply_register(&pdev->dev,
+							    &power->battery_desc,
+							    NULL);
 		if (IS_ERR(power->battery)) {
 			ret = PTR_ERR(power->battery);
 			goto err_usb;
···
 	irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "SYSLO"));
 	free_irq(irq, power);
 err_battery:
-	if (power->have_battery)
-		power_supply_unregister(power->battery);
 err_usb:
-	power_supply_unregister(power->usb);
 err_wall:
-	power_supply_unregister(power->wall);
 err:
 	return ret;
 }
···
 
 	irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "SYSLO"));
 	free_irq(irq, wm831x_power);
-
-	if (wm831x_power->have_battery)
-		power_supply_unregister(wm831x_power->battery);
-	power_supply_unregister(wm831x_power->wall);
-	power_supply_unregister(wm831x_power->usb);
 }
 
 static struct platform_driver wm831x_power_driver = {