loplugin:passstuffbyref in sax

Change-Id: I95f0a17b9b8bab592a60f6b5223b4668c5355275

include/sax/tools/documenthandleradapter.hxx

@@ -93,7 +93,7 @@ namespace sax
         {
             m_handler = delegate;
         }
-        css::uno::Reference< css::xml::sax::XDocumentHandler > SAL_CALL
+        const css::uno::Reference< css::xml::sax::XDocumentHandler >& SAL_CALL
         getDelegate()
         {
             return m_handler;
@@ -215,7 +215,7 @@ namespace sax
         {
             m_handler = delegate;
         }
-        css::uno::Reference< css::xml::sax::XExtendedDocumentHandler > SAL_CALL
+        const css::uno::Reference< css::xml::sax::XExtendedDocumentHandler >& SAL_CALL
         getDelegate()
         {
             return m_handler;

sax/source/tools/CachedOutputStream.hxx

@@ -51,7 +51,7 @@ public:
     {}
     ~CachedOutputStream() {}
 
-    css::uno::Reference< css::io::XOutputStream > getOutputStream() const
+    const css::uno::Reference< css::io::XOutputStream >& getOutputStream() const
     {
         return mxOutputStream;
     }