gpiolib: Don't shadow error code of gpiochip_lock_as_irq()

gpiochip_lock_as_irq() may return a few error codes,
do not shadow them by -EINVAL and let caller to decide.

No functional change intended.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpiolib.c

@@ -1805,16 +1805,18 @@ static const struct irq_domain_ops gpiochip_domain_ops = {
 static int gpiochip_irq_reqres(struct irq_data *d)
 {
 	struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
+	int ret;
 
 	if (!try_module_get(chip->gpiodev->owner))
 		return -ENODEV;
 
-	if (gpiochip_lock_as_irq(chip, d->hwirq)) {
+	ret = gpiochip_lock_as_irq(chip, d->hwirq);
+	if (ret) {
 		chip_err(chip,
 			"unable to lock HW IRQ %lu for IRQ\n",
 			d->hwirq);
 		module_put(chip->gpiodev->owner);
-		return -EINVAL;
+		return ret;
 	}
 	return 0;
 }