That's probably not meant to be a C++ reference to a uno::Reference

...as introduced with e75f6e54 "sfx2: make
SfxClassificationHelper not require a full doc shell".  Made
CppunitTest_sfx2_classification crash now when dereferencing
m_xDocumentProperties in
SfxClassificationHelper::Impl::pushToDocumentProperties, when built with a
recent Clang trunk build.

Change-Id: Id0b7fa0627b9642f748f07d7dfa05353114225fa

sfx2/source/view/classificationhelper.cxx

@@ -331,7 +331,7 @@ public:
     std::map<SfxClassificationPolicyType, SfxClassificationCategory> m_aCategory;
     /// Possible categories of a policy to choose from.
     std::vector<SfxClassificationCategory> m_aCategories;
-    const uno::Reference<document::XDocumentProperties>& m_xDocumentProperties;
+    uno::Reference<document::XDocumentProperties> m_xDocumentProperties;
 
     explicit Impl(const uno::Reference<document::XDocumentProperties>& xDocumentProperties);
     void parsePolicy();