usb: dwc3-xilinx: 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>
Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/20230517230239.187727-23-u.kleine-koenig@pengutronix.deSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/dwc3/dwc3-xilinx.c

@@ -305,7 +305,7 @@ static int dwc3_xlnx_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int dwc3_xlnx_remove(struct platform_device *pdev)
+static void dwc3_xlnx_remove(struct platform_device *pdev)
 {
 	struct dwc3_xlnx	*priv_data = platform_get_drvdata(pdev);
 	struct device		*dev = &pdev->dev;
@@ -318,8 +318,6 @@ static int dwc3_xlnx_remove(struct platform_device *pdev)
 	pm_runtime_disable(dev);
 	pm_runtime_put_noidle(dev);
 	pm_runtime_set_suspended(dev);
-
-	return 0;
 }
 
 static int __maybe_unused dwc3_xlnx_runtime_suspend(struct device *dev)
@@ -388,7 +386,7 @@ static const struct dev_pm_ops dwc3_xlnx_dev_pm_ops = {
 
 static struct platform_driver dwc3_xlnx_driver = {
 	.probe		= dwc3_xlnx_probe,
-	.remove		= dwc3_xlnx_remove,
+	.remove_new	= dwc3_xlnx_remove,
 	.driver		= {
 		.name		= "dwc3-xilinx",
 		.of_match_table	= dwc3_xlnx_of_match,