gpio: rdc321x: Convert PCIBIOS_* return codes to errnos

rdc_gpio_config() uses pci_{read,write}_config_dword() that return
PCIBIOS_* codes. rdc_gpio_config() is used for
direction_{input,output}() in the struct gpio_chip which both require
normal errnos to be returned.

Similarly, rdc321x_gpio_probe() that is probe function returns
PCIBIOS_* codes without converting them first into normal errnos.

Convert PCIBIOS_* returns code using pcibios_err_to_errno() into normal
errno before returning them to fix both issues.
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20240527132345.13956-2-ilpo.jarvinen@linux.intel.comSigned-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

drivers/gpio/gpio-rdc321x.c

@@ -102,7 +102,7 @@ static int rdc_gpio_config(struct gpio_chip *chip,
 unlock:
 	spin_unlock(&gpch->lock);
 
-	return err;
+	return pcibios_err_to_errno(err);
 }
 
 /* configure GPIO pin as input */
@@ -170,13 +170,13 @@ static int rdc321x_gpio_probe(struct platform_device *pdev)
 					rdc321x_gpio_dev->reg1_data_base,
 					&rdc321x_gpio_dev->data_reg[0]);
 	if (err)
-		return err;
+		return pcibios_err_to_errno(err);
 
 	err = pci_read_config_dword(rdc321x_gpio_dev->sb_pdev,
 					rdc321x_gpio_dev->reg2_data_base,
 					&rdc321x_gpio_dev->data_reg[1]);
 	if (err)
-		return err;
+		return pcibios_err_to_errno(err);
 
 	dev_info(&pdev->dev, "registering %d GPIOs\n",
 					rdc321x_gpio_dev->chip.ngpio);