sme: Check for prev_bssid from sme_event_disassoc

wpa_s->bssid is already cleared by mark_disassoc() when we're getting the
disassociation event for the case where wpa_supplicant requested
disassociation. wpa_s->sme.prev_bssid holds the BSSID we need to check
for, so use that instead.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

wpa_supplicant/sme.c

@@ -474,7 +474,7 @@ void sme_event_disassoc(struct wpa_supplicant *wpa_s,
 			union wpa_event_data *data)
 {
 	wpa_printf(MSG_DEBUG, "SME: Disassociation event received");
-	if (!is_zero_ether_addr(wpa_s->bssid) &&
+	if (wpa_s->sme.prev_bssid_set &&
 	    !(wpa_s->drv_flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME)) {
 		/*
 		 * cfg80211/mac80211 can get into somewhat confused state if
@@ -484,7 +484,7 @@ void sme_event_disassoc(struct wpa_supplicant *wpa_s,
 		 */
 		wpa_printf(MSG_DEBUG, "SME: Deauthenticate to clear driver "
 			   "state");
-		wpa_drv_deauthenticate(wpa_s, wpa_s->bssid,
+		wpa_drv_deauthenticate(wpa_s, wpa_s->sme.prev_bssid,
 				       WLAN_REASON_DEAUTH_LEAVING);
 	}
 }