message: Fix resource variable leak after Lookup
diff: @@ -83,6 +83,7 @@ Status GetResourceVariableDtypeAndShapeInternal(
  "ResourceHandle does not exist, or is not a resource variable: ",
  resource_handle.DebugString());
  }
  + core::ScopedUnref unref(resource_var);
  // Return the result.
  *result = std::make_pair(resource_var->tensor()->dtype(),
  