wlantest: Do not report decryption failures for WEP keys if no keys

If no WEP keys are available, there is not going to be an attempt to
decrypt the frame, so don't claim decryption failed.

Signed-off-by: Jouni Malinen <j@w1.fi>

wlantest/rx_data.c

@@ -260,8 +260,9 @@ static void rx_data_bss_prot_group(struct wlantest *wt,
 
 	check_plaintext_prot(wt, hdr, data, len);
 	keyid = data[3] >> 6;
-	if (bss->gtk_len[keyid] == 0 && bss->group_cipher != WPA_CIPHER_WEP40)
-	{
+	if (bss->gtk_len[keyid] == 0 &&
+	    (bss->group_cipher != WPA_CIPHER_WEP40 ||
+	     dl_list_empty(&wt->wep))) {
 		add_note(wt, MSG_MSGDUMP, "No GTK known to decrypt the frame "
 			 "(A2=" MACSTR " KeyID=%d)",
 			 MAC2STR(hdr->addr2), keyid);