AP: Don't increment auth_transaction upon SAE authentication failure

IEEE Std 802.11-2016, 12.4.7.6 specifies:

An SAE Commit message with a status code not equal to SUCCESS shall
indicate that a peer rejects a previously sent SAE Commit message.

An SAE Confirm message, with a status code not equal to SUCCESS, shall
indicate that a peer rejects a previously sent SAE Confirm message.

Thus when SAE authentication failure happens, authentication transaction
sequence number should not be incremented.

Signed-off-by: Jia Ding <jiad@codeaurora.org>

src/ap/ieee802_11.c

@@ -3943,8 +3943,10 @@ static void handle_auth(struct hostapd_data *hapd,
 
  fail:
 	reply_res = send_auth_reply(hapd, sta, mgmt->sa, mgmt->bssid, auth_alg,
-				    auth_transaction + 1, resp, resp_ies,
-				    resp_ies_len, "handle-auth");
+				    auth_alg == WLAN_AUTH_SAE ?
+				    auth_transaction : auth_transaction + 1,
+				    resp, resp_ies, resp_ies_len,
+				    "handle-auth");
 
 	if (sta && sta->added_unassoc && (resp != WLAN_STATUS_SUCCESS ||
 					  reply_res != WLAN_STATUS_SUCCESS)) {