Fix refleak

Objects/descrobject.c

@@ -1237,6 +1237,7 @@ property_copy(PyObject *old, PyObject *get, PyObject *set, PyObject *del,
 	}
 	
 	new =  PyObject_CallFunction(type, "OOOO", get, set, del, doc);
+	Py_DECREF(type);
 	if (new == NULL)
 		return NULL;
 	pnew = (propertyobject *)new;