no need to take a copy of the getProcessComponentContext return value

we can just take a "const &".

(found by running clang-tidy with the
performance-unnecessary-copy-initialization warning)

Change-Id: I20fd208c65303da78170b1ac06c638fdf3aa094b
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/176267
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
Tested-by: Jenkins

xmlhelp/source/cxxhelp/provider/urlparameter.cxx

@@ -802,7 +802,7 @@ InputStreamTransformer::InputStreamTransformer( URLParameter* urlParam,
 
         if( bAddExtensionPath )
         {
-            Reference< XComponentContext > xContext(
+            const Reference< XComponentContext >& xContext(
                 comphelper::getProcessComponentContext() );
 
             OUString aOUExpandedExtensionPath = Databases::expandURL( aExtensionRegistryPath, xContext );