cfg80211: check for current_bss from giwrate

When connecting to an ESSID manually, we may not set the BSSID, and thus
wdev->wext.connect.bssid will be NULL.
wdev->current_bss is always updated when a connection is established so we
should check it first.
Signed-off-by: Samuel Ortiz <samuel.ortiz@intel.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/wireless/wext-compat.c

@@ -1136,8 +1136,11 @@ int cfg80211_wext_giwrate(struct net_device *dev,
 	if (!rdev->ops->get_station)
 		return -EOPNOTSUPP;
 
+	if (wdev->current_bss)
+		addr = wdev->current_bss->pub.bssid;
+	else if (wdev->wext.connect.bssid)
 		addr = wdev->wext.connect.bssid;
-	if (!addr)
+	else
 		return -EOPNOTSUPP;
 
 	err = rdev->ops->get_station(&rdev->wiphy, dev, addr, &sinfo);