ucbhelper: get rid of pointless scope in ContentImplHelper::release

Change-Id: I5a35674115388288190e3a6496010badc32cf589
diff --git a/ucbhelper/source/provider/contenthelper.cxx b/ucbhelper/source/provider/contenthelper.cxx
index 70418ef8..00ae20e 100644
--- a/ucbhelper/source/provider/contenthelper.cxx
+++ b/ucbhelper/source/provider/contenthelper.cxx
@@ -152,10 +152,8 @@ void SAL_CALL ContentImplHelper::release()
    rtl::Reference< ContentProviderImplHelper > xKeepProviderAlive(
        m_xProvider );

    {
        osl::MutexGuard aGuard( m_xProvider->m_aMutex );
        OWeakObject::release();
    }
    osl::MutexGuard aGuard( m_xProvider->m_aMutex );
    OWeakObject::release();
}

uno::Any SAL_CALL ContentImplHelper::queryInterface( const uno::Type & rType )