coverity#1371452 Wrapper object use after free

have another stab at silencing that

Change-Id: Ia3fe1c072bd8062a13991bbb2eca008264450138

filter/source/xsltfilter/LibXSLTTransformer.cxx

@@ -327,7 +327,6 @@ namespace XSLT
             m_transformer->error(msg);
         }
         closeOutput();
-        m_tcontext->_private = nullptr;
         oh.reset();
         xsltFreeStylesheet(styleSheet);
         xsltFreeTransformContext(m_tcontext);