fixe issue #6 FreeBSD compilation warnings

Author: mcarbonneaux

mod_auth_memcookie.c

@@ -263,8 +263,8 @@ static int get_Auth_memCookie_grp(request_rec *r, char *szGroup, char *szGroups)
 
     /* Add delimiters at start and end of groups string */
     /* and search group with delimiters */
-    szMyGroups=apr_pstrcat(r->pool,":",szGroups,":",0);
-    szMyGroup=apr_pstrcat(r->pool,":",szGroup,":",0);
+    szMyGroups=apr_pstrcat(r->pool,":",szGroups,":",NULL);
+    szMyGroup=apr_pstrcat(r->pool,":",szGroup,":",NULL);
 
     if (!strstr(szMyGroups,szMyGroup))
         return DECLINED;