Warning compiling image-dired.el

[Eli Zaretskii]

    ELC      image-dired.elc

  In end of data:
  image-dired.el:2913:14: Warning: the function `image-mode-fit' is not known 
to be defined.

The call to image-mode-fit was introduced in commit 73a6c8f9.  I don't
see that function anywhere, and there are no comments near its call to
explain what is this call supposed to achieve.  (Why should we try
"fitting" an image in a command that's supposed to display the image
in its full size?)