ath9k: fix a crash in led init

SVN-Revision: 29558

package/mac80211/patches/581-ath9k_extra_platform_leds.patch

@@ -56,11 +56,14 @@
  
  	INIT_LIST_HEAD(&sc->leds);
  
-@@ -133,6 +154,9 @@ void ath_init_leds(struct ath_softc *sc)
+@@ -133,6 +154,12 @@ void ath_init_leds(struct ath_softc *sc)
  		trigger = ieee80211_get_radio_led_name(sc->hw);
  
  	ath_create_gpio_led(sc, sc->sc_ah->led_pin, led_name, trigger, 1);
 +
++	if (!pdata)
++		return;
++
 +	for (i = 0; i < pdata->num_leds; i++)
 +		ath_create_platform_led(sc, &pdata->leds[i]);
  }