usb: octeon-hcd: 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/20230517230239.187727-64-u.kleine-koenig@pengutronix.deSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/octeon-hcd.c

@@ -3680,7 +3680,7 @@ static int octeon_usb_probe(struct platform_device *pdev)
 	return 0;
 }
 
-static int octeon_usb_remove(struct platform_device *pdev)
+static void octeon_usb_remove(struct platform_device *pdev)
 {
 	int status;
 	struct device *dev = &pdev->dev;
@@ -3696,8 +3696,6 @@ static int octeon_usb_remove(struct platform_device *pdev)
 		dev_dbg(dev, "USB shutdown failed with %d\n", status);
 
 	usb_put_hcd(hcd);
-
-	return 0;
 }
 
 static const struct of_device_id octeon_usb_match[] = {
@@ -3714,7 +3712,7 @@ static struct platform_driver octeon_usb_driver = {
 		.of_match_table = octeon_usb_match,
 	},
 	.probe      = octeon_usb_probe,
-	.remove     = octeon_usb_remove,
+	.remove_new = octeon_usb_remove,
 };
 
 static int __init octeon_usb_driver_init(void)