P2P: Fix wpas_p2p_add_persistent_group_client() to use P2P mgmt interface

The function used wpa_s->parent->conf to iterate the P2P networks and
update the configuration file. However, wpa_s->parent is not
necessarily the interface used to manage the P2P Device operations.

Fix this by accessing the configuration file of the interface initialized
to managed the P2P Device operations.

Signed-off-by: Ilan Peer <ilan.peer@intel.com>

wpa_supplicant/p2p_supplicant.c

@@ -1113,13 +1113,14 @@ static void wpas_p2p_add_persistent_group_client(struct wpa_supplicant *wpa_s,
 	u8 *n;
 	size_t i;
 	int found = 0;
+	struct wpa_supplicant *p2p_wpa_s = wpa_s->global->p2p_init_wpa_s;
 
 	ssid = wpa_s->current_ssid;
 	if (ssid == NULL || ssid->mode != WPAS_MODE_P2P_GO ||
 	    !ssid->p2p_persistent_group)
 		return;
 
-	for (s = wpa_s->parent->conf->ssid; s; s = s->next) {
+	for (s = p2p_wpa_s->conf->ssid; s; s = s->next) {
 		if (s->disabled != 2 || s->mode != WPAS_MODE_P2P_GO)
 			continue;
 
@@ -1178,8 +1179,8 @@ static void wpas_p2p_add_persistent_group_client(struct wpa_supplicant *wpa_s,
 			  0xff, ETH_ALEN);
 	}
 
-	if (wpa_s->parent->conf->update_config &&
-	    wpa_config_write(wpa_s->parent->confname, wpa_s->parent->conf))
+	if (p2p_wpa_s->conf->update_config &&
+	    wpa_config_write(p2p_wpa_s->confname, p2p_wpa_s->conf))
 		wpa_printf(MSG_DEBUG, "P2P: Failed to update configuration");
 }