message: Fix a small bug: a check for an (impossible) error condition was wrong, and
  so was instead checking for a different (also impossible) error condition.
diff: @@ -167,7 +167,7 @@ absl::Status TfLiteEngine::InitInterpreter(
  absl::StrCat("Could not build the TF Lite interpreter: ",
  error_reporter_.error_message));
  }
  - if (interpreter_out == nullptr) {
  + if (*interpreter_out == nullptr) {
  return CreateStatusWithPayload(StatusCode::kInternal,
  "TF Lite interpreter is null.");
  }
  