gpio: Avoid using pin ranges with !PINCTRL

Do not use the struct gpio_device's .pin_ranges field if the PINCTRL
Kconfig symbol is not selected to avoid build failures.

Fixes: 2ab73c6d ("gpio: Support GPIO controllers without pin-ranges")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20200330090257.2332864-1-thierry.reding@gmail.comReviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Tested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpiolib.c

@@ -2745,10 +2745,12 @@ static inline void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip)
  */
 int gpiochip_generic_request(struct gpio_chip *chip, unsigned offset)
 {
-	if (!list_empty(&chip->gpiodev->pin_ranges))
-		return pinctrl_gpio_request(chip->gpiodev->base + offset);
-
+#ifdef CONFIG_PINCTRL
+	if (list_empty(&chip->gpiodev->pin_ranges))
 		return 0;
+#endif
+
+	return pinctrl_gpio_request(chip->gpiodev->base + offset);
 }
 EXPORT_SYMBOL_GPL(gpiochip_generic_request);