remoteproc: wkup_m3: 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/20230504194453.1150368-19-u.kleine-koenig@pengutronix.de
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>

Author: Uwe Kleine-König

drivers/remoteproc/wkup_m3_rproc.c

@@ -223,16 +223,14 @@ static int wkup_m3_rproc_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int wkup_m3_rproc_remove(struct platform_device *pdev)
+static void wkup_m3_rproc_remove(struct platform_device *pdev)
 {
 	struct rproc *rproc = platform_get_drvdata(pdev);
 
 	rproc_del(rproc);
 	rproc_free(rproc);
 	pm_runtime_put_sync(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
-
-	return 0;
 }
 
 #ifdef CONFIG_PM
@@ -253,7 +251,7 @@ static const struct dev_pm_ops wkup_m3_rproc_pm_ops = {
 
 static struct platform_driver wkup_m3_rproc_driver = {
 	.probe = wkup_m3_rproc_probe,
-	.remove = wkup_m3_rproc_remove,
+	.remove_new = wkup_m3_rproc_remove,
 	.driver = {
 		.name = "wkup_m3_rproc",
 		.of_match_table = wkup_m3_rproc_of_match,