found by PMD

Change-Id: I05b45382b8fb1b734657ce9421a20e6ef6fbe542
Reviewed-on: https://gerrit.libreoffice.org/12376Tested-by: LibreOffice gerrit bot <gerrit@libreoffice.org>
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>