message: Fix memory leak in SetOpAttrValueScalar
diff: @@ -1587,6 +1587,7 @@ void SetOpAttrValueScalar(TFE_Context* ctx, TFE_Op* op,
  // require TFE_Op* and just convert it internally a NameAttrValue, so
  // consider adding an overload to the C API to make this case easier.
  TFE_OpSetAttrFunction(op, attr_name, func_op);
  + TFE_DeleteOp(func_op);
  } break;
  case tensorflow::AttrValue::kList:
  TF_FALLTHROUGH_INTENDED;
  