TNC: Send EAP-Failure on TNC failure

On PEAP(TNC), hostapd integrated RADIUS server doesn't return
EAP-Failure when "Recommendation = none". So, EAP data retransmittion
occurs.

My co-worker "Ryuji Ohba" made below patch.

src/eap_server/eap_tnc.c

@@ -500,7 +500,7 @@ static void eap_tnc_process(struct eap_sm *sm, void *priv,
 static Boolean eap_tnc_isDone(struct eap_sm *sm, void *priv)
 {
 	struct eap_tnc_data *data = priv;
-	return data->state == DONE;
+	return data->state == DONE || data->state == FAIL;
 }