message: [vault] improve code quality
  Closes:
  Approved by: aching
diff: @@ -245,12 +245,7 @@ impl Client {
  .upgrade_request(request)
  .send_json(json!({ "type": "ed25519", "exportable": exportable }));
  match resp.status() {
  - 200 => {
  - // Explicitly clear buffer so the stream can be re-used.
  - resp.into_string()?;
  - Ok(())
  - }
  - 204 => {
  + 200 | 204 => {
  // Explicitly clear buffer so the stream can be re-used.
  resp.into_string()?;
  Ok(())
  