(comint-mode): Don't both with make-local-hook.

lisp/comint.el

@@ -512,7 +512,6 @@ Entry to this mode runs the hooks on `comint-mode-hook'."
   (make-local-variable 'comint-scroll-to-bottom-on-input)
   (make-local-variable 'comint-scroll-to-bottom-on-output)
   (make-local-variable 'comint-scroll-show-maximum-output)
-  (make-local-hook 'pre-command-hook)
   (add-hook 'pre-command-hook 'comint-preinput-scroll-to-bottom t t)
   (make-local-hook 'comint-output-filter-functions)
   (make-local-hook 'comint-exec-hook)