platform/x86: wmi: 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 (mostly) ignored
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.

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20230302144732.1903781-29-u.kleine-koenig@pengutronix.deReviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

drivers/platform/x86/wmi.c

@@ -1369,7 +1369,7 @@ static void acpi_wmi_notify_handler(acpi_handle handle, u32 event,
 		event, 0);
 }
 
-static int acpi_wmi_remove(struct platform_device *device)
+static void acpi_wmi_remove(struct platform_device *device)
 {
 	struct acpi_device *acpi_device = ACPI_COMPANION(&device->dev);
 
@@ -1379,8 +1379,6 @@ static int acpi_wmi_remove(struct platform_device *device)
 				ACPI_ADR_SPACE_EC, &acpi_wmi_ec_space_handler);
 	wmi_free_devices(acpi_device);
 	device_unregister(dev_get_drvdata(&device->dev));
-
-	return 0;
 }
 
 static int acpi_wmi_probe(struct platform_device *device)
@@ -1468,7 +1466,7 @@ static struct platform_driver acpi_wmi_driver = {
 		.acpi_match_table = wmi_device_ids,
 	},
 	.probe = acpi_wmi_probe,
-	.remove = acpi_wmi_remove,
+	.remove_new = acpi_wmi_remove,
 };
 
 static int __init acpi_wmi_init(void)