backlight: pwm_bl: Remove useless call to pwm_set_period()

The PWM period will be set when calling pwm_config. Remove this useless
call to pwm_set_period(), which might mess up the internal PWM state.
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

drivers/video/backlight/pwm_bl.c

@@ -313,10 +313,8 @@ static int pwm_backlight_probe(struct platform_device *pdev)
 	 * via the PWM lookup table.
 	 */
 	pb->period = pwm_get_period(pb->pwm);
-	if (!pb->period && (data->pwm_period_ns > 0)) {
+	if (!pb->period && (data->pwm_period_ns > 0))
 		pb->period = data->pwm_period_ns;
-		pwm_set_period(pb->pwm, data->pwm_period_ns);
-	}
 
 	pb->lth_brightness = data->lth_brightness * (pb->period / pb->scale);