bug#51029: 28.0.60; ibuffer-shrink-to-fit: Symbol’s value as variable is void: ibuffer-auto-mode

[Stefan Kangas]

Y. E. <yet@ego.team> writes:

>> > I suppose the attached would fix it.
>
>> Y. E., could you please check if this patch fixes the issue for you?
>
> Yes, the patch works fine for me, thank you.

Martin, could you install the patch on emacs-28 or master according to
what you think is best?  Thanks.