Hi,

In the attached patch, I propose a fix for the recent change of the
function `rcirc-buffer-process'. This function used to return the rcirc
server process when it existed, or nil. However, since a78d87e7ed it
raises an error.

This is a problem if the user kills the server buffer before it kills
the channels' buffer because it is not possible to kill them after that.
(The function `rcirc-clean-up-buffer' is called via `kill-buffer-hook'
and it calls `rcirc-buffer-process'.)

WDYT?

Regards,