leds: don't disable blinking when writing the same value to delay_on or delay_off

Function led_set_software_blink() assumes that blink timer is still running,
but commit 488bc35b introduced disabling
of blink timer before each call to led_set_software_blink().

Correct led_software_blink():
1) remove protection against reprogramming blink timer to the same values,
   because it only disables blinking now,
2) remove unnecessary call to led_stop_software_blink().
Signed-off-by: Rafal Prylowski <prylowski@metasoft.pl>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

drivers/leds/led-core.c

@@ -44,13 +44,6 @@ static void led_set_software_blink(struct led_classdev *led_cdev,
 	if (!led_cdev->blink_brightness)
 		led_cdev->blink_brightness = led_cdev->max_brightness;
 
-	if (led_get_trigger_data(led_cdev) &&
-	    delay_on == led_cdev->blink_delay_on &&
-	    delay_off == led_cdev->blink_delay_off)
-		return;
-
-	led_stop_software_blink(led_cdev);
-
 	led_cdev->blink_delay_on = delay_on;
 	led_cdev->blink_delay_off = delay_off;