reported by Cppcheck

Change-Id: I737c2bd7be197ef9d0b29b922acd8021fefb7af6
Signed-off-by: Jochen Nitschke <j.nitschke+logerrit@ok.de>
Reviewed-on: https://gerrit.libreoffice.org/22059Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Tested-by: Markus Mohrhard <markus.mohrhard@googlemail.com>