Fix SAS 0x40 control byte handling and column name parsing
- [x] closes #31243 (Replace xxxx with the Github issue number)
- [x] [Tests added and passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#writing-tests) if fixing a bug or adding a new feature
- [x] All [code checks passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit).
- [x] Added an entry in the latest `doc/source/whatsnew/vX.X.X.rst` file if fixing a bug or adding a new feature.

See https://github.com/Roche/pyreadstat/blob/b8efa675af9a7af703d4c411de768a2053e94d64/src/sas/readstat_sas_rle.c#L65-L67 Hello @jonashaag! Thanks for updating this PR. We checked the lines you've touched for [PEP 8](https://www.python.org/dev/peps/pep-0008) issues, and found:





There are currently no PEP 8 issues detected in this Pull Request. Cheers! :beers: 

##### Comment last updated at 2022-06-15 20:39:47 UTC we don't have an explict test file for this that repros? Oh wow, thanks for checking, this must have gone lost during a rebase. @jreback @jreback  Thanks @jonashaag 