bug#22099: Path to fix bug in function erc-kill-query-buffers

[Lars Ingebrigtsen]

Francis Litterio <flitterio@gmail.com> writes:

> In the latest Emacs sources (Git branch "master"), function
> erc-kill-query-buffers fails to protect against being passed nil
> for argument PROCESS, which causes all channel buffers on all
> servers to be deleted!  This can happen if command /QUIT is issued
> in a disconnected server buffer and variable erc-kill-queries-on-quit
> is non-nil.
>
> This patch fixes this problem.

Thanks; applied to emacs-25.

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