RTF export: remove unused parameter of IsExportNumRule()

Change-Id: I75bc321a1997fe250ac6a7cb5dced50a76c36413
Reviewed-on: https://gerrit.libreoffice.org/21909Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Jenkins <ci@libreoffice.org>

sw/source/filter/ww8/rtfexport.cxx

@@ -177,7 +177,7 @@ void RtfExport::WriteChar(sal_Unicode)
     /* WriteChar() has nothing to do for rtf. */
 }
 
-static bool IsExportNumRule(const SwNumRule& rRule, sal_uInt8* pEnd = nullptr)
+static bool IsExportNumRule(const SwNumRule& rRule)
 {
     sal_uInt8 nEnd = MAXLEVEL;
     while (nEnd-- && !rRule.GetNumFormat(nEnd))
@@ -195,8 +195,6 @@ static bool IsExportNumRule(const SwNumRule& rRule, sal_uInt8* pEnd = nullptr)
             break;
     }
 
-    if (pEnd)
-        *pEnd = nEnd;
     return nLvl != nEnd;
 }