message: Fix G3 reported ubsan warning
diff: @@ -205,7 +205,7 @@ private:
  mutable TypedUniformBuffer<ShadowUib> mShadowUb;
  backend::Handle<backend::HwBufferObject> mShadowUbh;
  - ShadowMappingUniforms mShadowMappingUniforms;
  + ShadowMappingUniforms mShadowMappingUniforms = {};
  ShadowMap::SceneInfo mSceneInfo;
  