[TASK] Small code cleanup in CacheHashCalculator

Resolves: #78814
Releases: master
Change-Id: I18475fa8daa006e8887cf4b1c3855bf0e870fdc6
Reviewed-on: https://review.typo3.org/50769


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Gianluigi Martino <gmartino27@gmail.com>
Reviewed-by: Susanne Moog <susanne.moog@typo3.org>
Tested-by: Susanne Moog <susanne.moog@typo3.org>