Fix memory leak in tuple-returning getters

dtool/src/interrogate/interfaceMakerPythonNative.cxx

@@ -6113,7 +6113,7 @@ write_make_seq(ostream &out, Object *obj, const std::string &ClassName,
       << "    return NULL;\n"
       << "  }\n"
       << "\n"
-      << "  PyObject *getter = PyObject_GetAttrString(self, \"" << element_name << "\");\n"
+      << "  PyObject *getter = PyDict_GetItemString(Dtool_" << ClassName << "._PyType.tp_dict, \"" << element_name << "\");\n"
       << "  if (getter == (PyObject *)NULL) {\n"
       << "    return NULL;\n"
       << "  }\n"
@@ -6127,7 +6127,7 @@ write_make_seq(ostream &out, Object *obj, const std::string &ClassName,
       << "#else\n"
       << "    PyObject *index = PyInt_FromSsize_t(i);\n"
       << "#endif\n"
-      << "    PyObject *value = PyObject_CallFunctionObjArgs(getter, index, NULL);\n"
+      << "    PyObject *value = PyObject_CallFunctionObjArgs(getter, self, index, NULL);\n"
       << "    PyTuple_SET_ITEM(tuple, i, value);\n"
       << "    Py_DECREF(index);\n"
       << "  }\n"