Otherwise it will fail assertion in SbxValue::Clear, because
SvRefBase::ReleaseRef would check that its current count is
not zero. In release builds, not doing this would leak.
Change-Id: I80dfc815f8a2b651ff290af10808212281abf246
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/100879
Tested-by: Mike Kaganski <mike.kaganski@collabora.com>
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>