Avoid global recursive calls to kill-buffer-hooks, and fit into 80 cols.

Avoid global recursive calls to kill-buffer-hooks, and fit into 80 cols.
* lisp/textmodes/ispell.el (ispell-process-buffer-name): Remove.
(ispell-start-process): Avoid setq and simplify logic.
(ispell-init-process): Setup kill-buffer-hook locally when needed.
(kill-buffer-hook): Don't use it globally with code that uses
expand-file-name since that may call kill-buffer via
code_conversion_restore.