base-files: make diag.sh stub working in bash

SVN-Revision: 15527

package/base-files/files/etc/diag.sh

@@ -1,4 +1,4 @@
 #!/bin/sh
-# Copyright (C) 2006 OpenWrt.org
+# Copyright (C) 2006-2009 OpenWrt.org
 
-set_state() :
+set_state() { :; }