Redirect loop when accessing "user/register" as an unauthenticated user

Problem/Motivation

When user/register is blacklisted by default, and its set to be denied for unauthenticated user, an infinite redirect loop occurs.

Visiting a page with a default 40x menu response code triggers an infinite redirect loop.
This happens because drupal_goto reads from the $_GET['destination'] which is set inside the pages with MENU_NOT_FOUND or MENU_ACCESS_DENIED responses as part of the drupal_deliver_html_page() function.

Proposed resolution

Remove the destination url when calling drupal_goto. This is how most modules deal with it.

Remaining tasks

Submit a patch.

User interface changes

N/A

API changes

N/A