Bluetooth: Return false when not shut down

    InitializeCompleteCallback initialize_complete_cb,

    PacketReadCallback event_cb, PacketReadCallback acl_cb,

    PacketReadCallback sco_cb) {

  LOG_ALWAYS_FATAL_IF(g_vendor_interface, "%s: No previous Shutdown()?",

                      __func__);

  if (g_vendor_interface) {

    ALOGE("%s: No previous Shutdown()?", __func__);

    return false;

  }

  g_vendor_interface = new VendorInterface();

  return g_vendor_interface->Open(initialize_complete_cb, event_cb, acl_cb,

                                  sco_cb);