WaE: illegal copy-initialization

warning C4928: illegal copy-initialization; more than one user-defined
conversion has been implicitly applied. So use a variable of the
correct type, should not affect the intent of the code.

sc/source/ui/vba/vbaworkbooks.cxx

@@ -82,7 +82,7 @@ getWorkbook( uno::Reference< uno::XComponentContext >& xContext, const uno::Refe
     if ( pShell )
     {
         String sCodeName = pShell->GetDocument()->GetCodeName();
-        uno::Reference< uno::XInterface > xIf = getUnoDocModule( sCodeName, pShell );
+        uno::Reference< XHelperInterface > xIf = getUnoDocModule( sCodeName, pShell );
                 if ( xIf.is() )
                 {
                     OSL_TRACE(" *** Returning Module uno Object *** ");