sw: fix temp file leak in SwDocTest

Change-Id: I493af417e9bf6c781638a5a2ec10c3bed32d1b8a

sw/qa/core/uwriter.cxx

@@ -1263,8 +1263,9 @@ void SwDocTest::setUp()
 
 void SwDocTest::tearDown()
 {
+    m_pDoc = 0; // deleted by DoClose()
+    m_xDocShRef->DoClose();
     m_xDocShRef.Clear();
-    delete m_pDoc;
 
     BootstrapFixture::tearDown();
 }