[6.0] 10c8db66f fix vmodtool error message

[Dridi Boukelmoune]

commit 10c8db66fd6a90ba3fc81139c94d5dfc7052ca27
Author: Nils Goroll <nils.goroll at uplex.de>
Date:   Wed Nov 28 13:51:10 2018 +0100

    fix vmodtool error message

diff --git a/lib/libvcc/vmodtool.py b/lib/libvcc/vmodtool.py
index 4886c4e26..2ef32e78c 100755
--- a/lib/libvcc/vmodtool.py
+++ b/lib/libvcc/vmodtool.py
@@ -874,7 +874,7 @@ class vcc(object):
             d = "".join(ss[1:])
             m = DISPATCH.get(toks[0])
             if m is None:
-                err("Unknown stanze $%s" % ss[:i])
+                err("Unknown stanza $%s" % toks[0], warn=False)
             m(toks, [c[0], " ".join(c[1:])], d.split('\n'), self)
             inputline = None