message: fix erroneous assign
diff: @@ -348,7 +348,7 @@ class Env {
  /// \brief starts a new transaction on the filesystem that handles filename
  Status StartTransaction(const std::string& filename,
  TransactionToken** token) {
  - token = nullptr;
  + *token = nullptr;
  return Status::OK();
  }
  @@ -369,7 +369,7 @@ class Env {
  /// \brief Returns the transaction for `path` or nullptr in `token`
  Status GetTransactionForPath(const std::string& path,
  TransactionToken** token) {
  - token = nullptr;
  + *token = nullptr;
  return Status::OK();
  }
  