WPS ER: Deinit ER before WPS registrar/context

ER code may still touch WPS registrar/context during deinit, so better
do that before freeing the other WPS components.

wpa_supplicant/wps_supplicant.c

@@ -898,6 +898,11 @@ void wpas_wps_deinit(struct wpa_supplicant *wpa_s)
 	if (wpa_s->wps == NULL)
 		return;
 
+#ifdef CONFIG_WPS_ER
+	wps_er_deinit(wpa_s->wps_er);
+	wpa_s->wps_er = NULL;
+#endif /* CONFIG_WPS_ER */
+
 	wps_registrar_deinit(wpa_s->wps->registrar);
 	wpabuf_free(wpa_s->wps->dh_pubkey);
 	wpabuf_free(wpa_s->wps->dh_privkey);
@@ -906,11 +911,6 @@ void wpas_wps_deinit(struct wpa_supplicant *wpa_s)
 	os_free(wpa_s->wps->network_key);
 	os_free(wpa_s->wps);
 	wpa_s->wps = NULL;
-
-#ifdef CONFIG_WPS_ER
-	wps_er_deinit(wpa_s->wps_er);
-	wpa_s->wps_er = NULL;
-#endif /* CONFIG_WPS_ER */
 }