func: void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
  
  {
  
      BlockJob *job = find_block_job(device);
  
  
  
      if (!job) {
  
          error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
  
          return;
  
      }
  
  
  
      block_job_set_speed(job, speed, errp);
  
  }
  