Fixed #10585: comment redirects built from the `next` parameter now work...

Fixed #10585: comment redirects built from the `next` parameter now work correctly when `next` already contains a query string.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@10424 bcc190cf-cafb-0310-a4f2-bffc1f526a37