leds: gpio: Use GPIOF_OUT_INIT_LOW instead of hardcoded zero

Use the GPIO flag definition instead of a numeric literal, so the casual
reader grepping for GPIOF_ will find the GPIO flags used.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>

drivers/leds/leds-gpio.c

@@ -86,7 +86,7 @@ static int create_gpio_led(const struct gpio_led *template,
 		 * still uses GPIO numbers. Ultimately we would like to get
 		 * rid of this block completely.
 		 */
-		unsigned long flags = 0;
+		unsigned long flags = GPIOF_OUT_INIT_LOW;
 
 		/* skip leds that aren't available */
 		if (!gpio_is_valid(template->gpio)) {