wlcore: correctly check state before regdomain conf

The wlcore state was checked without the mutex being taken. This leads
to WARN_ONs sometimes if a notification arrives when the driver
is on, but the mutex is only taken after it is off. This usually
happens if stopping the driver while connected to a network.
Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>

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

@@ -108,7 +108,6 @@ static void wl1271_reg_notify(struct wiphy *wiphy,
 
 	}
 
-	if (likely(wl->state == WLCORE_STATE_ON))
 	wlcore_regdomain_config(wl);
 }
 
@@ -3364,6 +3363,10 @@ void wlcore_regdomain_config(struct wl1271 *wl)
 		return;
 
 	mutex_lock(&wl->mutex);
+
+	if (unlikely(wl->state != WLCORE_STATE_ON))
+		goto out;
+
 	ret = wl1271_ps_elp_wakeup(wl);
 	if (ret < 0)
 		goto out;