pwm: pca9685: Use gpio core provided macro GPIO_LINE_DIRECTION_OUT

GPIO core recently added macro to uniformly specify direction of a GPIO
line, so use it.
Signed-off-by: Rishi Gupta <gupt21@gmail.com>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

drivers/pwm/pwm-pca9685.c

@@ -167,7 +167,7 @@ static int pca9685_pwm_gpio_get_direction(struct gpio_chip *chip,
 					  unsigned int offset)
 {
 	/* Always out */
-	return 0;
+	return GPIO_LINE_DIRECTION_OUT;
 }
 
 static int pca9685_pwm_gpio_direction_input(struct gpio_chip *gpio,