Fix stylistic issues uncovered by cppcheck

[chrchr-github]

See
cppcheck-opensource/cppcheck#8303
cppcheck-opensource/cppcheck#8291
cppcheck-opensource/cppcheck#8399

[chrchr-github]

Fixed by #643 and #639

[firewave]

Either not all of them have been addressed or there is an unknown issue with unmatchedSuppression because the simplecpp.h suppressions still persist after cppcheck-opensource/cppcheck#8582.

[chrchr-github]

Maybe there is an issue, because I'm getting the same warnings which were fixed in #639
https://github.com/cppcheck-opensource/cppcheck/actions/runs/26506777078/job/78061086273?pr=8586

[firewave]

simplecpp had not yet been updated in your PR. Checking those messages that matches the fixes. So I assume it is an issue with unmatchedSuppression and headers. Will take a look later.

[firewave]

It's a bug, alright. I filed https://trac.cppcheck.net/ticket/14792 about it.