utf-16-le-pre-write-conversion not defined

[Hans-Christoph Wirth]

In GNU Emacs 21.4.1 (i686-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2005-05-12 on ypsilon
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: en_US
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: de_DE.UTF-8
  locale-coding-system: utf-8
  default-enable-multibyte-characters: t

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

                            **** **** ****

1. Load a file in utf-16 (common file format in Windows):

   C-x RET c utf-16-le-dos RET
   C-x C-f filename RET

2. Do some edits

3. Save with C-x C-s

   This throws an error about utf-16-le-pre-write-conversion not defined
   as function.  The file is not saved.


I'm not sure what this function is supposed to do; when I define it
as a noop function, it works for me: 
   (defun utf-16-le-pre-write-conversion (a b))