RFKILL: allow one to specify led trigger name

Allow the rfkill driver to specify led trigger name.
By default it still defaults to the name of rfkill switch.
Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>
Acked-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Acked-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/rfkill/rfkill.c

@@ -589,7 +589,8 @@ static void rfkill_led_trigger_register(struct rfkill *rfkill)
 #ifdef CONFIG_RFKILL_LEDS
 	int error;
 
-	rfkill->led_trigger.name = rfkill->dev.bus_id;
+	if (!rfkill->led_trigger.name)
+		rfkill->led_trigger.name = rfkill->dev.bus_id;
 	error = led_trigger_register(&rfkill->led_trigger);
 	if (error)
 		rfkill->led_trigger.name = NULL;