[BUGFIX] Make recycler PHP 7.2 compatible

Change-Id: I36167b0a8b61532adbafea93c88c93097ea52d73
Resolves: #83297
Releases: master, 8.7, 7.6
Reviewed-on: https://review.typo3.org/55042


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Tested-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>