...preventing the dtor from ever being called.  (DocumentEvents forwards its
acquire/release calls to its m_pData->rParent, i.e., the ODatabaseDocument, for
better or worse.)  This caused ODatabaseDocument instances to be leaked during
e.g. JunitTest_dbaccess_complex.  Regression introduced with
de2ac128 "loplugin:useuniqueptr in dbaccess".

Change-Id: Ida073c7e576b88e0d1d1a90253445e946e6eac99
Reviewed-on: https://gerrit.libreoffice.org/45652Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>