r = bus_foreach_bus(u->manager, NULL, u->sent_dbus_new_signal ? send_changed_signal : send_new_signal, u);
if (r < 0)
r = bus_foreach_bus(u->manager, NULL, u->sent_dbus_new_signal ? send_changed_signal : send_new_signal, u);
if (r < 0)
r = bus_foreach_bus(u->manager, NULL, send_removed_signal, u);
if (r < 0)
r = bus_foreach_bus(u->manager, NULL, send_removed_signal, u);
if (r < 0)