[gnome-continuous] autobuilder: Fix an undefined variable

[Jasper St. Pierre <jstpierre src gnome org>]

commit 54b5252e4d139cf0d968b1bce9ad68ddda612d1d
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Wed Oct 9 17:43:20 2013 -0400

    autobuilder: Fix an undefined variable

 src/js/builtins/autobuilder.js |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/js/builtins/autobuilder.js b/src/js/builtins/autobuilder.js
index 3d982f9..0a8adad 100644
--- a/src/js/builtins/autobuilder.js
+++ b/src/js/builtins/autobuilder.js
@@ -96,6 +96,8 @@ const Autobuilder = new Lang.Class({
     },
 
     _onTaskCompleted: function(taskmaster, task, success, error) {
+        let cancellable = null;
+
         if (!task.changed)
             GSystem.shutil_rm_rf(task.buildPath, cancellable);