By the new Py_TPFLAGS_METHOD_DESCRIPTOR flag, a new code path is
activated, and when extension types like PySide create a new
class, we observe negative refcounts.

The reason is that the code in typeobject.c fkt. type_mro_modified
calls lookup_maybe_method which returns a _borrowed_ reference.
This happens in the "if (custom) {" branch.

Removing all Py_XDECREF calls from the function fixes that.