irqchip/renesas-irqc: Convert to platform_driver::remove_new() callback

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>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/2d367ab738ed2e4cf58cffc10d64b0cbe8a1322c.1703284359.git.u.kleine-koenig@pengutronix.de

Author: Uwe Kleine-König

drivers/irqchip/irq-renesas-irqc.c

@@ -218,14 +218,13 @@ static int irqc_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int irqc_remove(struct platform_device *pdev)
+static void irqc_remove(struct platform_device *pdev)
 {
 	struct irqc_priv *p = platform_get_drvdata(pdev);
 
 	irq_domain_remove(p->irq_domain);
 	pm_runtime_put(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
-	return 0;
 }
 
 static int __maybe_unused irqc_suspend(struct device *dev)
@@ -248,11 +247,11 @@ MODULE_DEVICE_TABLE(of, irqc_dt_ids);
 
 static struct platform_driver irqc_device_driver = {
 	.probe		= irqc_probe,
-	.remove		= irqc_remove,
+	.remove_new	= irqc_remove,
 	.driver		= {
-		.name	= "renesas_irqc",
+		.name		= "renesas_irqc",
 		.of_match_table	= irqc_dt_ids,
-		.pm	= &irqc_pm_ops,
+		.pm		= &irqc_pm_ops,
 	}
 };