If we use a reference to the object we need to ensure that it not
suddenly disappears on us.

Change-Id: I7917fc696b0cc48dd26fa332c892f09727e40054
Reviewed-on: https://gerrit.libreoffice.org/41820Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Tested-by: Jenkins <ci@libreoffice.org>