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When a new buffer is created with `gnus-get-buffer-create' it's added to
the list `gnus-buffers' to make sure we get rid of it when we quit Gnus.

This is fine, but in some cases the buffers are killed before we quit
Gnus.  This means that `gnus-buffers' just keeps growing.  It contained
hundreds of #<killed buffer>'s when I noticed.

I've fixed the places that I have come across, but there's probably
still some cases in parts of the code I don't use.

To help find any remaining cases you can install the following hook; use
Gnus for a while, and then look if there's any output in the
*kill trace* buffer.


(defun my-kill-buffer ()
  (when (and (boundp 'gnus-buffers)
	     (member (current-buffer) gnus-buffers))
    (let ((standard-output (get-buffer-create "*kill trace*")))
      (backtrace))))

(add-hook 'kill-buffer-hook 'my-kill-buffer)