message: Fix uninitialized use msan failure.
diff: @@ -912,7 +912,7 @@ TEST(FunctionCallFrame, Void_Void) {
  TF_EXPECT_OK(frame.SetArgs({}));
  auto a = test::AsTensor<float>({100});
  HasError(frame.SetArgs({a}), "Invalid argument");
  - const Tensor* v;
  + const Tensor* v = nullptr;
  HasError(frame.GetArg(0, &v), "Invalid argument");
  if (v != nullptr) {
  // v is null in certain environments.
  