bug#885: dired deleting a file can delete the entire directory

[a a]

If you create a file whose filename is a double quotation mark and try to 
delete it in dired-mode, and if you say yes to the questions, the entire 
directory is deleted.

out@themovies:~% mkdir test
out@themovies:~% cd test
out@themovies:~/test% touch \"\"

Now in emacs dired-mode remove the file ""

  /home/out/test:
  total used in directory 24 available 263498424
  drwxr-xr-x   2 out out  4096 2008-09-04 08:28 .
  drwxr-xr-x 133 out out 20480 2008-09-04 08:28 ..
D -rw-r--r--   1 out out     0 2008-09-04 08:28 ""

Delete  (yes or no) yes
Recursive delete of ? (yes or no) yes
Killed dired buffer of , too (y or n) y

Instead of just removing the file, the entire directory /home/out/test is 
deleted.

The machine is running Ubuntu 7.10 (Gutsy), the version of emacs is 23.0.60.1, 
from
Alexandre Vassalotti's deb package with xft support:

deb http://ppa.launchpad.net/avassalotti/ubuntu gutsy main

% emacs-snapshot-gtk --version
GNU Emacs 23.0.60.1
Copyright (C) 2008 Free Software Foundation, Inc.
GNU Emacs comes with ABSOLUTELY NO WARRANTY.
You may redistribute copies of Emacs
under the terms of the GNU General Public License.
For more information about these matters, see the file named COPYING.

apt-cache policy emacs-snapshot
emacs-snapshot:
  Installed: 1:20080228-2~gutsy
  Candidate: 1:20080228-2~gutsy
  Version table:
 *** 1:20080228-2~gutsy 0
        500 http://ppa.launchpad.net gutsy/main Packages
        100 /var/lib/dpkg/status
     1:20070805-1ubuntu1 0
        500 http://archive.ubuntu.com gutsy/universe Packages
        500 http://us.archive.ubuntu.com gutsy/universe Packages