func: void net_host_device_remove(Monitor *mon, int vlan_id, const char *device)
  
  {
  
      VLANState *vlan;
  
      VLANClientState *vc;
  
  
  
      vlan = qemu_find_vlan(vlan_id);
  
  
  
     for(vc = vlan->first_client; vc != NULL; vc = vc->next)
  
          if (!strcmp(vc->name, device))
  
              break;
  
  
  
      if (!vc) {
  
          monitor_printf(mon, "can't find device %s\n", device);
  
          return;
  
      }
  
      qemu_del_vlan_client(vc);
  
  }
  