[gnome-shell] background: s/NULL/null/

[Ray Strode <halfline src gnome org>]

commit 09c14f1a1074a2844ebafa67eeb02750f23b44ec
Author: Ray Strode <rstrode redhat com>
Date:   Tue Feb 19 21:07:44 2013 -0500

    background: s/NULL/null/
    
    woops.

 js/ui/background.js |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/js/ui/background.js b/js/ui/background.js
index 4fda6f4..9d79e43 100644
--- a/js/ui/background.js
+++ b/js/ui/background.js
@@ -165,7 +165,7 @@ const BackgroundCache = new Lang.Class({
             content = candidateContent.copy(params.monitorIndex, params.effects);
 
             if (params.cancellable && params.cancellable.is_cancelled())
-                content = NULL;
+                content = null;
 
             if (params.onFinished)
                 params.onFinished(content);