P2P: Use the P2P Device interface in wpas_p2p_fallback_to_go_neg()

Previously the wpa_s->parent interface was used, which is not
necessarily the P2P Device management interface.

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

wpa_supplicant/p2p_supplicant.c

@@ -7111,7 +7111,7 @@ static int wpas_p2p_fallback_to_go_neg(struct wpa_supplicant *wpa_s,
 
 	if (wpa_s->global->p2p_group_formation)
 		group = wpa_s->global->p2p_group_formation;
-	wpa_s = wpa_s->parent;
+	wpa_s = wpa_s->global->p2p_init_wpa_s;
 	offchannel_send_action_done(wpa_s);
 	if (group_added)
 		ret = wpas_p2p_group_delete(group, P2P_GROUP_REMOVAL_SILENT);