[BUGFIX] Use proper type in LinkAnalyzer to avoid exceptions

To avoid exceptions, the proper type must be used.

Resolves: #79166
Releases: master
Change-Id: I00a6d65bee8b8807853461bfad681f354ae02045
Reviewed-on: https://review.typo3.org/51319


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Joerg Boesche <typo3@joergboesche.de>
Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Andreas Fernandez <typo3@scripting-base.de>