Do not send GNonce in EAPOL-Key group message 1/2

While the IEEE Std 802.11-2016 is still indicating that GNonce would be
exchanged in EAPOL-Key messages (see, e.g., Figure 12-52 showing the
Send EAPOL-Key operation in the REKEYNEGOTIATING state or the sample
group key handshake in Figure 12-47), there are also examples of
describing this field as having value zero (e.g., 12.7.7.2 Group key
handshake message 1).

GNonce is used only with the Authenticator and the Supplicant does not
have any use for it, so it is better not to expose that internal value.
Hardcode the Key Nonce field to 0 in EAPOL-Key group message 1/2.

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

src/ap/wpa_auth.c

@@ -3104,7 +3104,7 @@ SM_STATE(WPA_PTK_GROUP, REKEYNEGOTIATING)
 		       (wpa_mic_len(sm->wpa_key_mgmt) ? WPA_KEY_INFO_MIC : 0) |
 		       WPA_KEY_INFO_ACK |
 		       (!sm->Pair ? WPA_KEY_INFO_INSTALL : 0),
-		       rsc, gsm->GNonce, kde, kde_len, gsm->GN, 1);
+		       rsc, NULL, kde, kde_len, gsm->GN, 1);
 
 	os_free(kde_buf);
 }