Libertas: fix WARN_ON issues in cfg80211 support

In following scenarios WARN_ON() in cfg80211 code was triggered.
a) Driver unload or card removal.
b) Disconnect from infra network
c) Adhoc start/join
d) Adhoc stop
Added following fixes to avoid WARN_ON() in cfg80211 code.
a) Ensured that cfg80211_disconnected() function defined in cfg80211
code will be called only in infra mode.
b) Solved timing issue by moving cfg80211_disconnected() call inside
lbs_cfg_disconnect().
c) Updated "wdev->ssid" in driver code after Adhoc join/start
d) Removed unnecessory cfg80211_disconnected() call in lbs_remove_card.

Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kiran Divekar <dkiran@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/libertas/cmdresp.c b/drivers/net/wireless/libertas/cmdresp.c
index 9c18227..52b543c 100644
--- a/drivers/net/wireless/libertas/cmdresp.c
+++ b/drivers/net/wireless/libertas/cmdresp.c
@@ -31,7 +31,9 @@
 	 * It causes problem in the Supplicant
 	 */
 	msleep_interruptible(1000);
-	lbs_send_disconnect_notification(priv);
+
+	if (priv->wdev->iftype == NL80211_IFTYPE_STATION)
+		lbs_send_disconnect_notification(priv);
 
 	/* report disconnect to upper layer */
 	netif_stop_queue(priv->dev);