staging: wilc1000: adds a cfg80211_disconnected() function

This patch is adds a cfg80211_disconnected() when connection is lost already.
We was find this situation while test the 'rmmod sdio'.
SDIO remove function are include both remove mac_close and unregister net_device.
That is received one more a disconnect cmd from cfg80211.
Driver was already performed disconnect.
If wilc->close value was set to true, adds a call to cfg80211_disconnected().
Signed-off-by: Leo Kim <leo.kim@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wilc1000/wilc_wfi_cfgoperations.c

@@ -819,11 +819,22 @@ static int disconnect(struct wiphy *wiphy, struct net_device *dev, u16 reason_co
 	struct wilc_priv *priv;
 	struct host_if_drv *pstrWFIDrv;
 	struct wilc_vif *vif;
+	struct wilc *wilc;
 	u8 NullBssid[ETH_ALEN] = {0};
 
 	wilc_connecting = 0;
 	priv = wiphy_priv(wiphy);
 	vif = netdev_priv(priv->dev);
+	wilc = vif->wilc;
+
+	if (!wilc)
+		return -EIO;
+
+	if (wilc->close) {
+		/* already disconnected done */
+		cfg80211_disconnected(dev, 0, NULL, 0, true, GFP_KERNEL);
+		return 0;
+	}
 
 	pstrWFIDrv = (struct host_if_drv *)priv->hif_drv;
 	if (!pstrWFIDrv->p2p_connect)