cfg80211: reset auth algorithm

When the interface is brought down, we need to
reset the auth algorithm because wpa_supplicant
doesn't reset it, and then we fail to use shared
key auth when required later.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/wireless/core.c

@@ -579,6 +579,7 @@ static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
 			kfree(wdev->wext.ie);
 			wdev->wext.ie = NULL;
 			wdev->wext.ie_len = 0;
+			wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
 #endif
 			cfg80211_disconnect(rdev, dev,
 					    WLAN_REASON_DEAUTH_LEAVING, true);