remoteproc: keystone: 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/20230504194453.1150368-5-u.kleine-koenig@pengutronix.deSigned-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>

drivers/remoteproc/keystone_remoteproc.c

@@ -476,7 +476,7 @@ static int keystone_rproc_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int keystone_rproc_remove(struct platform_device *pdev)
+static void keystone_rproc_remove(struct platform_device *pdev)
 {
 	struct keystone_rproc *ksproc = platform_get_drvdata(pdev);
 
@@ -486,8 +486,6 @@ static int keystone_rproc_remove(struct platform_device *pdev)
 	pm_runtime_disable(&pdev->dev);
 	rproc_free(ksproc->rproc);
 	of_reserved_mem_device_release(&pdev->dev);
-
-	return 0;
 }
 
 static const struct of_device_id keystone_rproc_of_match[] = {
@@ -501,7 +499,7 @@ MODULE_DEVICE_TABLE(of, keystone_rproc_of_match);
 
 static struct platform_driver keystone_rproc_driver = {
 	.probe	= keystone_rproc_probe,
-	.remove	= keystone_rproc_remove,
+	.remove_new = keystone_rproc_remove,
 	.driver	= {
 		.name = "keystone-rproc",
 		.of_match_table = keystone_rproc_of_match,