tdf#125424: properly reset temporarily cleared guard

Since the guard is only cleared optionally, most probably the code after
the conditional block is expected to be guarded until the second clear.

Change-Id: I913cb4bff42140da605a6f45414bece419f4a4c8
Reviewed-on: https://gerrit.libreoffice.org/72689
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>
diff --git a/ucb/source/ucp/hierarchy/hierarchycontent.cxx b/ucb/source/ucp/hierarchy/hierarchycontent.cxx
index e0ac3c8..923225a 100644
--- a/ucb/source/ucp/hierarchy/hierarchycontent.cxx
+++ b/ucb/source/ucp/hierarchy/hierarchycontent.cxx
@@ -1002,7 +1002,7 @@ uno::Sequence< uno::Any > HierarchyContent::setPropertyValues(
        const uno::Sequence< beans::PropertyValue >& rValues,
        const uno::Reference< ucb::XCommandEnvironment > & xEnv )
{
    osl::ClearableGuard< osl::Mutex > aGuard( m_aMutex );
    osl::ResettableGuard< osl::Mutex > aGuard( m_aMutex );

    uno::Sequence< uno::Any > aRet( rValues.getLength() );
    uno::Sequence< beans::PropertyChangeEvent > aChanges( rValues.getLength() );
@@ -1253,6 +1253,7 @@ uno::Sequence< uno::Any > HierarchyContent::setPropertyValues(
                    "Exchange failed!",
                    static_cast< cppu::OWeakObject * >( this ) );
        }
        aGuard.reset();
    }

    if ( !aOldTitle.isEmpty() )