message: nydusify: remove useless {} and use default arm to catch the unexpected
  As titled and no logic was ever changed.
diff: @@ -25,15 +25,14 @@ func NewBackend(backendType, backendConfig string) (Backend, error) {
  if err := json.Unmarshal([]byte(backendConfig), &config); err != nil {
  return nil, errors.Wrap(err, "parse backend config")
  }
  - {
  return newOSSBackend(
  config["endpoint"],
  config["bucket_name"],
  config["access_key_id"],
  config["access_key_secret"],
  )
  - }
  + default:
  + return nil, fmt.Errorf("unsupported backend type: %s", backendType)
  }
  - return nil, fmt.Errorf("unsupported backend type: %s", backendType)
  }
  