gh-148119: Refactor `get_type_attr_as_size` to improve error handling in `structseq.c` by Wulian233 · Pull Request #148120 · python/cpython

Please add skip-news label

This PR fixes a bug and changes user facing behavior, so it likely needs a news entry. However, since this bug is unlikely to occur in practice, I'm not entirely sure whether one is necessary.