bug#66982: 30.0.50; Cannot delete bookmark of inaccessible remote file

[Liu Hui]

Recipe:

1. Save the following text as the test bookmark file

;;;; Emacs Bookmark Format Version 1;;;; -*- coding: utf-8-emacs;
mode: lisp-data -*-
;;; This format is meant to be slightly human-readable;
;;; nevertheless, you probably don't want to edit it.
;;; -*- End Of Bookmark File Format Version Stamp -*-
(("test" (filename . "/ssh:192.168.0.100:~/") (front-context-string)
 (rear-context-string . "g-style=literal\n") (position . 68)
 (last-modified 25595 64776 373828 978000)))

2. emacs -Q --eval '(setq bookmark-default-file xxx)' -f list-bookmarks

3. press d, then x.

However, the bookmark cannot be deleted because Emacs hangs or displays
tramp error message/popup window after several seconds.