drm/atmel-hlcdc: 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>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230507162616.1368908-7-u.kleine-koenig@pengutronix.de

drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c

@@ -773,15 +773,13 @@ static int atmel_hlcdc_dc_drm_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int atmel_hlcdc_dc_drm_remove(struct platform_device *pdev)
+static void atmel_hlcdc_dc_drm_remove(struct platform_device *pdev)
 {
 	struct drm_device *ddev = platform_get_drvdata(pdev);
 
 	drm_dev_unregister(ddev);
 	atmel_hlcdc_dc_unload(ddev);
 	drm_dev_put(ddev);
-
-	return 0;
 }
 
 static int atmel_hlcdc_dc_drm_suspend(struct device *dev)
@@ -826,7 +824,7 @@ static const struct of_device_id atmel_hlcdc_dc_of_match[] = {
 
 static struct platform_driver atmel_hlcdc_dc_platform_driver = {
 	.probe	= atmel_hlcdc_dc_drm_probe,
-	.remove	= atmel_hlcdc_dc_drm_remove,
+	.remove_new = atmel_hlcdc_dc_drm_remove,
 	.driver	= {
 		.name	= "atmel-hlcdc-display-controller",
 		.pm	= pm_sleep_ptr(&atmel_hlcdc_dc_drm_pm_ops),