[PATCH] libertas: access mesh_dev more carefully

The CF/SDIO firmware doesn't support Mesh, so priv->mesh_dev is
NULL there. Protect all accesses.

Signed-off-by: Holger Schurig <hs4233@mail.mn-solutions.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/libertas/scan.c b/drivers/net/wireless/libertas/scan.c
index 683fa1b..7f045ec 100644
--- a/drivers/net/wireless/libertas/scan.c
+++ b/drivers/net/wireless/libertas/scan.c
@@ -793,8 +793,10 @@
 	if (!scancurrentchanonly) {
 		netif_stop_queue(priv->dev);
 		netif_carrier_off(priv->dev);
-		netif_stop_queue(priv->mesh_dev);
-		netif_carrier_off(priv->mesh_dev);
+		if (priv->mesh_dev) {
+			netif_stop_queue(priv->mesh_dev);
+			netif_carrier_off(priv->mesh_dev);
+		}
 	}
 
 	ret = wlan_scan_channel_list(priv,
@@ -820,8 +822,10 @@
 	if (priv->adapter->connect_status == LIBERTAS_CONNECTED) {
 		netif_carrier_on(priv->dev);
 		netif_wake_queue(priv->dev);
-		netif_carrier_on(priv->mesh_dev);
-		netif_wake_queue(priv->mesh_dev);
+		if (priv->mesh_dev) {
+			netif_carrier_on(priv->mesh_dev);
+			netif_wake_queue(priv->mesh_dev);
+		}
 	}
 
 out: