ACPI: DPTF: Convert to platform remove callback returning void

The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.

To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().

Trivially convert these two drivers from always returning zero in the
remove callback to the void returning variant.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/dptf/dptf_pch_fivr.c

@@ -141,11 +141,9 @@ static int pch_fivr_add(struct platform_device *pdev)
 	return 0;
 }
 
-static int pch_fivr_remove(struct platform_device *pdev)
+static void pch_fivr_remove(struct platform_device *pdev)
 {
 	sysfs_remove_group(&pdev->dev.kobj, &pch_fivr_attribute_group);
-
-	return 0;
 }
 
 static const struct acpi_device_id pch_fivr_device_ids[] = {
@@ -159,7 +157,7 @@ MODULE_DEVICE_TABLE(acpi, pch_fivr_device_ids);
 
 static struct platform_driver pch_fivr_driver = {
 	.probe = pch_fivr_add,
-	.remove = pch_fivr_remove,
+	.remove_new = pch_fivr_remove,
 	.driver = {
 		.name = "dptf_pch_fivr",
 		.acpi_match_table = pch_fivr_device_ids,

drivers/acpi/dptf/dptf_power.c

@@ -209,7 +209,7 @@ static int dptf_power_add(struct platform_device *pdev)
 	return 0;
 }
 
-static int dptf_power_remove(struct platform_device *pdev)
+static void dptf_power_remove(struct platform_device *pdev)
 {
 	struct acpi_device *acpi_dev = platform_get_drvdata(pdev);
 
@@ -221,8 +221,6 @@ static int dptf_power_remove(struct platform_device *pdev)
 		sysfs_remove_group(&pdev->dev.kobj, &dptf_battery_attribute_group);
 	else
 		sysfs_remove_group(&pdev->dev.kobj, &dptf_power_attribute_group);
-
-	return 0;
 }
 
 static const struct acpi_device_id int3407_device_ids[] = {
@@ -242,7 +240,7 @@ MODULE_DEVICE_TABLE(acpi, int3407_device_ids);
 
 static struct platform_driver dptf_power_driver = {
 	.probe = dptf_power_add,
-	.remove = dptf_power_remove,
+	.remove_new = dptf_power_remove,
 	.driver = {
 		.name = "dptf_power",
 		.acpi_match_table = int3407_device_ids,