bug#1277: 23.0.60; select_window_norecord chokes on dead window

[Chong Yidong]

> (progn
>    (setq debug-on-error t)
>    (set-frame-height (selected-frame) 10)
>    (split-window)
>    (temp-buffer-resize-mode)
>    (setq temp-buffer-max-height 20))
>
> and do
>
>    C-h v temp-buffer-max-height
>
> Gets me
>
> Debugger entered--Lisp error: (wrong-type-argument window-live-p #<window 3>)
>    describe-variable(temp-buffer-max-height)
>    call-interactively(describe-variable nil nil)
>
> FWIW, the reason is that `fit-window-to-buffer' deletes prev_window
> temp_output_buffer_show eventually wants to resurrect after running
> `temp-buffer-show-hook'.  The attached patch fixes this for me.

Looks OK to me.