P2P: Flush services based on global p2p init and not p2p ifaces

As P2P service are not necessarily attached to a iface, when
added, proceed with same approach on p2p global deinit. Such
approach solves memory leaks ocurring upon wpa_supplicant
termination, when p2p services were registered previously.

Signed-off-by: Eduardo Abinader <eduardo.abinader@openbossa.org>

wpa_supplicant/p2p_supplicant.c

@@ -4077,8 +4077,8 @@ static void wpas_p2p_deinit_global(struct wpa_global *global)
 	struct wpa_supplicant *wpa_s, *tmp;
 
 	wpa_s = global->ifaces;
-	if (wpa_s)
-		wpas_p2p_service_flush(wpa_s);
+
+	wpas_p2p_service_flush(global->p2p_init_wpa_s);
 
 	if (global->p2p == NULL)
 		return;