usb: ehci-omap: 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>
Link: https://lore.kernel.org/r/20230517230239.187727-53-u.kleine-koenig@pengutronix.deSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/ehci-omap.c

@@ -237,7 +237,7 @@ static int ehci_hcd_omap_probe(struct platform_device *pdev)
  * the HCD's stop() method.  It is always called from a thread
  * context, normally "rmmod", "apmd", or something similar.
  */
-static int ehci_hcd_omap_remove(struct platform_device *pdev)
+static void ehci_hcd_omap_remove(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct usb_hcd *hcd = dev_get_drvdata(dev);
@@ -254,8 +254,6 @@ static int ehci_hcd_omap_remove(struct platform_device *pdev)
 	usb_put_hcd(hcd);
 	pm_runtime_put_sync(dev);
 	pm_runtime_disable(dev);
-
-	return 0;
 }
 
 static const struct of_device_id omap_ehci_dt_ids[] = {
@@ -267,7 +265,7 @@ MODULE_DEVICE_TABLE(of, omap_ehci_dt_ids);
 
 static struct platform_driver ehci_hcd_omap_driver = {
 	.probe			= ehci_hcd_omap_probe,
-	.remove			= ehci_hcd_omap_remove,
+	.remove_new		= ehci_hcd_omap_remove,
 	.shutdown		= usb_hcd_platform_shutdown,
 	/*.suspend		= ehci_hcd_omap_suspend, */
 	/*.resume		= ehci_hcd_omap_resume, */