WNM: Ignore WNM-Sleep Mode Response without pending request

Commit 03ed0a52393710be6bdae657d1b36efa146520e5 ('WNM: Ignore WNM-Sleep
Mode Response if WNM-Sleep Mode has not been used') started ignoring the
response when no WNM-Sleep Mode Request had been used during the
association. This can be made tighter by clearing the used flag when
successfully processing a response. This adds an additional layer of
protection against unexpected retransmissions of the response frame.

Bug: 65245581
Test: WiFi Integration suite
Change-Id: I8e6f16cb03c1054701a533761724394923eb504c
Signed-off-by: Jouni Malinen <j@w1.fi>
Signed-off-by: Glen Kuhne <kuh@google.com>
(cherry picked from commit 2fa0b2995505fddc7e27542bbfd83ca1760c6b9d)
diff --git a/wpa_supplicant/wnm_sta.c b/wpa_supplicant/wnm_sta.c
index 0b1a2db..bd0b517 100644
--- a/wpa_supplicant/wnm_sta.c
+++ b/wpa_supplicant/wnm_sta.c
@@ -260,7 +260,7 @@
 	if (!wpa_s->wnmsleep_used) {
-			   "WNM: Ignore WNM-Sleep Mode Response frame since WNM-Sleep Mode has not been used in this association");
+			   "WNM: Ignore WNM-Sleep Mode Response frame since WNM-Sleep Mode operation has not been requested");
@@ -299,6 +299,8 @@
+	wpa_s->wnmsleep_used = 0;
 	if (wnmsleep_ie->status == WNM_STATUS_SLEEP_ACCEPT ||
 	    wnmsleep_ie->status == WNM_STATUS_SLEEP_EXIT_ACCEPT_GTK_UPDATE) {
 		wpa_printf(MSG_DEBUG, "Successfully recv WNM-Sleep Response "