un-default argument

Change-Id: I5d60998b4c30f58ee9c734b37d3f97118db8d7cf
diff --git a/include/comphelper/logging.hxx b/include/comphelper/logging.hxx
index 1725340b3..d6aeb67 100644
--- a/include/comphelper/logging.hxx
+++ b/include/comphelper/logging.hxx
@@ -496,7 +496,7 @@ namespace comphelper
        ResourceBasedEventLogger(
            const css::uno::Reference< css::uno::XComponentContext >& _rxContext,
            const sal_Char* _pResourceBundleBaseName,
            const sal_Char* _pAsciiLoggerName = nullptr
            const sal_Char* _pAsciiLoggerName
        );