pinctrl: at91-pio4: Remove redundant return value check

Remove unneeded error handling on the result of a call
to platform_get_resource() when the value is passed to
devm_ioremap_resource().

Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-at91-pio4.c

@@ -971,10 +971,6 @@ static int atmel_pinctrl_probe(struct platform_device *pdev)
 	atmel_pioctrl->npins = atmel_pioctrl->nbanks * ATMEL_PIO_NPINS_PER_BANK;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		dev_err(dev, "unable to get atmel pinctrl resource\n");
-		return -EINVAL;
-	}
 	atmel_pioctrl->reg_base = devm_ioremap_resource(dev, res);
 	if (IS_ERR(atmel_pioctrl->reg_base))
 		return -EINVAL;