platform/surface: acpi-notify: 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() is renamed to .remove().

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>
Reviewed-by: Maximilian Luz <luzmaximilian@gmail.com>
Link: https://lore.kernel.org/r/20230917203805.1149595-3-u.kleine-koenig@pengutronix.deReviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

drivers/platform/surface/surface_acpi_notify.c

@@ -850,7 +850,7 @@ static int san_probe(struct platform_device *pdev)
 	return status;
 }
 
-static int san_remove(struct platform_device *pdev)
+static void san_remove(struct platform_device *pdev)
 {
 	acpi_handle san = ACPI_HANDLE(&pdev->dev);
 
@@ -864,8 +864,6 @@ static int san_remove(struct platform_device *pdev)
 	 * all delayed works they may have spawned are run to completion.
 	 */
 	flush_workqueue(san_wq);
-
-	return 0;
 }
 
 static const struct acpi_device_id san_match[] = {
@@ -876,7 +874,7 @@ MODULE_DEVICE_TABLE(acpi, san_match);
 
 static struct platform_driver surface_acpi_notify = {
 	.probe = san_probe,
-	.remove = san_remove,
+	.remove_new = san_remove,
 	.driver = {
 		.name = "surface_acpi_notify",
 		.acpi_match_table = san_match,