bug#23013: 25.0.92; assertion failure on marker outside text range in echo area

[Eli Zaretskii]

> Date: Tue, 15 Mar 2016 15:46:37 -0400
> From: Ken Raeburn <raeburn@permabit.com>
> Cc: 23013@debbugs.gnu.org
> 
> And the buffer still has a name; killing the buffer sets the name to
> nil.

Emacs will promptly recreate the echo-area buffers if they are killed.