pinctrl: Fix return value about devm_platform_ioremap_resource()

When call function devm_platform_ioremap_resource(), we should use IS_ERR()
to check the return value and return PTR_ERR() if failed.

Fixes: 4b024225 ("pinctrl: use devm_platform_ioremap_resource() to simplify code")
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Link: https://lore.kernel.org/r/1590234326-2194-1-git-send-email-yangtiezhu@loongson.cnSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/bcm/pinctrl-bcm281xx.c

@@ -1406,7 +1406,7 @@ static int __init bcm281xx_pinctrl_probe(struct platform_device *pdev)
 	pdata->reg_base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(pdata->reg_base)) {
 		dev_err(&pdev->dev, "Failed to ioremap MEM resource\n");
-		return -ENODEV;
+		return PTR_ERR(pdata->reg_base);
 	}
 
 	/* Initialize the dynamic part of pinctrl_desc */

drivers/pinctrl/pinctrl-at91-pio4.c

@@ -1019,7 +1019,7 @@ static int atmel_pinctrl_probe(struct platform_device *pdev)
 
 	atmel_pioctrl->reg_base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(atmel_pioctrl->reg_base))
-		return -EINVAL;
+		return PTR_ERR(atmel_pioctrl->reg_base);
 
 	atmel_pioctrl->clk = devm_clk_get(dev, NULL);
 	if (IS_ERR(atmel_pioctrl->clk)) {