mac80211: Don't access managed mode bits in non-managed mode

This fixes a stupid bug introduced in 25f85c31d4f..

Signed-off-by: Vasanthakumar Thiagarajan <vasanth@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/wext.c b/net/mac80211/wext.c
index 959aa83..a52fb3a 100644
--- a/net/mac80211/wext.c
+++ b/net/mac80211/wext.c
@@ -675,7 +675,7 @@
 		!sdata->default_key,
 		keybuf, erq->length);
 
-	if (!ret) {
+	if (!ret && sdata->vif.type == NL80211_IFTYPE_STATION) {
 		if (remove)
 			sdata->u.mgd.flags &= ~IEEE80211_STA_TKIP_WEP_USED;
 		else