[3.10] gh-97728: Argument Clinic: Fix uninitialized variable in the Py_UNICODE converter (GH-97729) by serhiy-storchaka · Pull Request #97760 · python/cpython

… the Py_UNICODE converter (pythonGH-97729)

It affects function os.system() on Windows and Windows-specific modules
winreg, _winapi, _overlapped, and _msi..
(cherry picked from commit 0ee9619)

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