gpio: acpi: Don't return 0 on acpi_gpio_count()

It's unusual to have error checking like (ret <= 0) in cases when
counting GPIO resources. In case when it's mandatory we propagate the
error (-ENOENT), otherwise we don't use the result.

This makes consistent behaviour across all possible variants called in
gpiod_count().
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpiolib-acpi.c

@@ -1098,7 +1098,7 @@ int acpi_gpio_count(struct device *dev, const char *con_id)
 					break;
 				}
 		}
-		if (count >= 0)
+		if (count > 0)
 			break;
 	}
 
@@ -1114,7 +1114,7 @@ int acpi_gpio_count(struct device *dev, const char *con_id)
 		if (crs_count > 0)
 			count = crs_count;
 	}
-	return count;
+	return count ? count : -ENOENT;
 }
 
 struct acpi_crs_lookup {