usb: ehci-brcm: 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>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Link: https://lore.kernel.org/r/20230517230239.187727-47-u.kleine-koenig@pengutronix.deSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/ehci-brcm.c

@@ -188,7 +188,7 @@ static int ehci_brcm_probe(struct platform_device *pdev)
 	return err;
 }
 
-static int ehci_brcm_remove(struct platform_device *dev)
+static void ehci_brcm_remove(struct platform_device *dev)
 {
 	struct usb_hcd *hcd = platform_get_drvdata(dev);
 	struct brcm_priv *priv = hcd_to_ehci_priv(hcd);
@@ -196,7 +196,6 @@ static int ehci_brcm_remove(struct platform_device *dev)
 	usb_remove_hcd(hcd);
 	clk_disable_unprepare(priv->clk);
 	usb_put_hcd(hcd);
-	return 0;
 }
 
 static int __maybe_unused ehci_brcm_suspend(struct device *dev)
@@ -250,7 +249,7 @@ static const struct of_device_id brcm_ehci_of_match[] = {
 
 static struct platform_driver ehci_brcm_driver = {
 	.probe		= ehci_brcm_probe,
-	.remove		= ehci_brcm_remove,
+	.remove_new	= ehci_brcm_remove,
 	.shutdown	= usb_hcd_platform_shutdown,
 	.driver		= {
 		.name	= "ehci-brcm",