memstick: rtsx_usb_ms: 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() will be 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>
Link: https://lore.kernel.org/r/80969cc7c08c613753bdf2270304983ed0dcc2a0.1712757795.git.u.kleine-koenig@pengutronix.deSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/memstick/host/rtsx_usb_ms.c

@@ -805,7 +805,7 @@ static int rtsx_usb_ms_drv_probe(struct platform_device *pdev)
 	return err;
 }
 
-static int rtsx_usb_ms_drv_remove(struct platform_device *pdev)
+static void rtsx_usb_ms_drv_remove(struct platform_device *pdev)
 {
 	struct rtsx_usb_ms *host = platform_get_drvdata(pdev);
 	struct memstick_host *msh = host->msh;
@@ -840,8 +840,6 @@ static int rtsx_usb_ms_drv_remove(struct platform_device *pdev)
 		": Realtek USB Memstick controller has been removed\n");
 	memstick_free_host(msh);
 	platform_set_drvdata(pdev, NULL);
-
-	return 0;
 }
 
 static struct platform_device_id rtsx_usb_ms_ids[] = {
@@ -855,7 +853,7 @@ MODULE_DEVICE_TABLE(platform, rtsx_usb_ms_ids);
 
 static struct platform_driver rtsx_usb_ms_driver = {
 	.probe		= rtsx_usb_ms_drv_probe,
-	.remove		= rtsx_usb_ms_drv_remove,
+	.remove_new	= rtsx_usb_ms_drv_remove,
 	.id_table       = rtsx_usb_ms_ids,
 	.driver		= {
 		.name	= "rtsx_usb_ms",