message: Remove a couple unused variables.
diff: @@ -1348,7 +1348,7 @@ mod test_get_metadata {
  let wallet = Wallet::new();
  let config = json!({"did": DID_1, "verkey": VERKEY_1}).to_string();
  Did::store_their_did(wallet.handle, &config).unwrap();
  - Did::set_metadata(wallet.handle, DID_1, METADATA);
  + Did::set_metadata(wallet.handle, DID_1, METADATA).unwrap();
  let result = Did::get_metadata(wallet.handle, DID_1);
  @@ -1395,7 +1395,7 @@ mod test_get_metadata {
  let (wallet, did) = setup();
  Did::set_metadata(wallet.handle, &did, METADATA).unwrap();
  - let result = Did::get_metadata_async(
  + Did::get_metadata_async(
  wallet.handle,
  &did,
  move |ec, metadata| sender.send((ec, metadata)).unwrap()
  @@ -1411,7 +1411,7 @@ mod test_get_metadata {
  fn get_metadata_async_invalid_wallet() {
  let (sender, receiver) = channel();
  - let result = Did::get_metadata_async(
  + Did::get_metadata_async(
  INVALID_HANDLE,
  DID_1,
  move |ec, metadata| sender.send((ec, metadata)).unwrap()
  