[issue31275] Check fall-through in _codecs_iso2022.c

[Stefan Krah]

Stefan Krah added the comment:


New changeset 138753c1b96b5e06a5c5d409fa4cae5e2fe1108b by Stefan Krah in branch 'master':
bpo-31275: Small refactoring to silence a fall-through warning. (#3206)
https://github.com/python/cpython/commit/138753c1b96b5e06a5c5d409fa4cae5e2fe1108b


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