message: Fix typo in TfLiteXNNPackDelegateGetThreadPool
diff: @@ -3324,7 +3324,7 @@ TfLiteDelegate* TfLiteXNNPackDelegateCreate(
  }
  void* TfLiteXNNPackDelegateGetThreadPool(TfLiteDelegate* delegate) {
  - if (delegate != nullptr) {
  + if (delegate == nullptr) {
  return nullptr;
  }
  