rndis_wlan: do not set default_key if not WEP key

rndis_set_default_key did call add_wep_key to set default key on device, even
if key is WPA. This caused rndis_wlan not work with wpa_supplicant in nl80211
mode (causing disconnect from AP).
Signed-off-by: NJussi Kivilinna <jussi.kivilinna@mbnet.fi>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rndis_wlan.c

@@ -2435,6 +2435,9 @@ static int rndis_set_default_key(struct wiphy *wiphy, struct net_device *netdev,
 
 	priv->encr_tx_key_index = key_index;
 
+	if (is_wpa_key(priv, key_index))
+		return 0;
+
 	key = priv->encr_keys[key_index];
 
 	return add_wep_key(usbdev, key.material, key.len, key_index);