wlcore: check wl->state before setting default key

wl1271_op_set_default_key_idx() lacks a check
of wl->state, causing the driver to try writing
to a powered-off device in some cases (e.g.
during recovery)

Signed-off-by: Eliad Peller <eliad@wizery.com>

drivers/net/wireless/ti/wlcore/main.c

@@ -3283,6 +3283,11 @@ static int wl1271_op_set_default_key_idx(struct ieee80211_hw *hw,
 
 	mutex_lock(&wl->mutex);
 
+	if (unlikely(wl->state != WLCORE_STATE_ON)) {
+		ret = -EAGAIN;
+		goto out_unlock;
+	}
+
 	ret = wl1271_ps_elp_wakeup(wl);
 	if (ret < 0)
 		goto out_unlock;