fb_update_7401() faild : Fatal error: Call to undefined function fb_graph()

Hi,

If update.php is run with the module disabled, fb_update_7401() function fails : "Fatal error: Call to undefined function fb_graph()".
The fb_graph() function is defined in the file fb.module but this file is not included by the method fb_update_7401().
For fix that we add a require_once() in fb_update_7401() (See the patch file attached)

Best regards,