[PATCH] rt2x00: fix NULL pointer exception

[Ivo van Doorn <ivdoorn@gmail.com>]

This will fix a NULL pointer exception when working in master mode.
When a master mode interface is added, the bssid is initialized,
when config_interface() is called the bssid is invalid (only with master mode)
so we cannot use that, instead the bssid inside the interface structure should
be used.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>

---

diff --git a/drivers/net/wireless/mac80211/rt2x00/rt2x00lib.c b/drivers/net/wireless/mac80211/rt2x00/rt2x00lib.c
index e882182..8dacf00 100644
--- a/drivers/net/wireless/mac80211/rt2x00/rt2x00lib.c
+++ b/drivers/net/wireless/mac80211/rt2x00/rt2x00lib.c
@@ -480,6 +480,7 @@ int rt2x00lib_config_interface(struct ieee80211_hw *hw, int if_id,
 	struct ieee80211_if_conf *conf)
 {
 	struct rt2x00_dev *rt2x00dev = hw->priv;
+	struct interface *intf = &rt2x00dev->interface;
 
 	/*
 	 * Monitor mode does not need configuring.
@@ -488,7 +489,7 @@ int rt2x00lib_config_interface(struct ieee80211_hw *hw, int if_id,
 	 */
 	if (conf->type == IEEE80211_IF_TYPE_MNTR)
 		return 0;
-	else if (conf->type != rt2x00dev->interface.type)
+	else if (conf->type != intf->type)
 		return -EINVAL;
 
 	/*
@@ -497,13 +498,13 @@ int rt2x00lib_config_interface(struct ieee80211_hw *hw, int if_id,
 	 * should now be set.
 	 */
 	if (conf->type != IEEE80211_IF_TYPE_AP)
-		memcpy(&rt2x00dev->interface.bssid, conf->bssid, ETH_ALEN);
+		memcpy(&intf->bssid, conf->bssid, ETH_ALEN);
 
 	/*
 	 * Enable configuration.
 	 */
 	rt2x00dev->lib_ops->config_type(rt2x00dev, conf->type);
-	rt2x00dev->lib_ops->config_bssid(rt2x00dev, conf->bssid);
+	rt2x00dev->lib_ops->config_bssid(rt2x00dev, intf->bssid);
 
 	return 0;
 }