Fix CI issue

Author: veyron95

paddle/fluid/pybind/eager_method.cc

@@ -97,7 +97,7 @@ class PyTensorVoidHook : public egr::TensorVoidHook {
  VLOG(3) << "Call PyTensorVoidHook";
 
  try {
- PyObject_CallFunctionObjArgs(py_func_);
+ PyObject_CallFunctionObjArgs(py_func_, nullptr);
  } catch (platform::EnforceNotMet& e) {
  throw std::move(e);
  } catch (std::exception& e) {