code: func removeDefaultBridgeInterface() {
  	if lnk, err := netlink.LinkByName(bridge.DefaultBridgeName); err == nil {
  		if err := netlink.LinkDel(lnk); err != nil {
  			logrus.Warnf("Failed to remove bridge interface (%s): %v", bridge.DefaultBridgeName, err)
  		}
  	}
  }
docs: // Remove default bridge interface if present (--bridge=none use case)