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: 4b024225c4a8 ("pinctrl: use devm_platform_ioremap_resource() to simplify code")
Signed-off-by: Tiezhu Yang <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Linus Walleij <[e-mail]>

drivers/pinctrl/bcm/pinctrl-bcm281xx.c

···
 	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

···
 
 	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)) {