bug#5319: 23.1; emacs crash in org-indent-mode

[Chong Yidong]

> 1. install org-mode-6.33f
> 2. start emacs: emacs -Q
> 3. create a buffer with some text then swith to org-indent-mode, as below
>
> C-x b buf <return>
> * a <return>
> C-u 100 <return>
> ** b <return>
> c <return>
> M-x org-mode
> M-x org-indent-mode
>
> 4. then emacs crash. emacs frame height should small than 100
>    to make emacs crash.

Thanks for the bug report.  I think this is related to a bug that I've
already fixed some months ago.  Could you kindly check if the problem
persists, using either the Emacs bzr repository, or the latest pretest
at:

  ftp://alpha.gnu.org/gnu/emacs/pretest/emacs-23.1.91.tar.gz