code: def deallocate_fw_dev(self, fw_id):
          
          for cnt in self.res:
              if fw_id in self.res.get(cnt).get('fw_id_lst'):
                  self.res[cnt]['used'] = self.res[cnt]['used'] - 1
                  self.res.get(cnt).get('fw_id_lst').remove(fw_id)
                  return
docs: Release the firewall resource.