ar71xx: swconfig: use the local helper to set LED brightness on link down

Use the 'swconfig_trig_set_brightness' function to set
the brightness value of the LED when the link goes down.
This ensures that the last brighness value is saved into
a local variable which is used to track the actual LED
status.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

SVN-Revision: 39402

target/linux/generic/files/drivers/net/phy/swconfig_leds.c

@@ -209,7 +209,7 @@ swconfig_trig_led_event(struct switch_led_trigger *sw_trig,
 	link = !!(sw_trig->port_link & port_mask);
 	if (!link) {
 		if (link != trig_data->prev_link)
-			led_set_brightness(trig_data->led_cdev, LED_OFF);
+			swconfig_trig_set_brightness(trig_data, LED_OFF);
 	} else {
 		unsigned long traffic;
 		int i;