bpo-41288: Fix a crash in unpickling invalid NEWOBJ_EX. (GH-21458)


Automerge-Triggered-By: @tiran
(cherry picked from commit 4f309abf55f0e6f8950ac13d6ec83c22b8d47bf8)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
3 files changed