suspicious MutexGuard placement

Change-Id: I3b5cf5984a1a852d2482b8a417fc46c836ea2dc2
Reviewed-on: https://gerrit.libreoffice.org/60258Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

ucb/source/ucp/webdav-neon/DAVSessionFactory.cxx

@@ -45,10 +45,10 @@ rtl::Reference< DAVSession > DAVSessionFactory::createDAVSession(
                 const uno::Sequence< beans::NamedValue >& rFlags,
                 const uno::Reference< uno::XComponentContext > & rxContext )
 {
-    m_xContext = rxContext;
-
     osl::MutexGuard aGuard( m_aMutex );
 
+    m_xContext = rxContext;
+
     if ( !m_xProxyDecider.get() )
         m_xProxyDecider.reset( new ucbhelper::InternetProxyDecider( rxContext ) );