[4.1] 7fd5d87 Typo

[Dridi Boukelmoune]

commit 7fd5d87f5de0faec5cc3ec6afb1f3e926d61357f
Author: Dridi Boukelmoune <dridi.boukelmoune at gmail.com>
Date:   Fri Jul 10 17:56:51 2015 +0200

    Typo

diff --git a/bin/varnishtest/witness.py b/bin/varnishtest/witness.py
index 081429e..6723ef0 100644
--- a/bin/varnishtest/witness.py
+++ b/bin/varnishtest/witness.py
@@ -12,7 +12,7 @@ from __future__ import print_function
 d = dict()
 a = dict()
 
-fi = open("_w")
+fi = open("_.w")
 fo = open("/tmp/_.dot", "w")
 
 fo.write('''digraph {