gpio: merrifield: Use dev_err_probe()

Improve error handling in the probe() function with dev_err_probe().

Signed-off-by: Andy Shevchenko <[e-mail]>

drivers/gpio/gpio-merrifield.c

···
 		return retval;
 
 	retval = pcim_iomap_regions(pdev, BIT(1) | BIT(0), pci_name(pdev));
-	if (retval) {
-		dev_err(&pdev->dev, "I/O memory mapping error\n");
-		return retval;
-	}
+	if (retval)
+		return dev_err_probe(dev, retval, "I/O memory mapping error\n");
 
 	base = pcim_iomap_table(pdev)[1];