bug#56528: 29.0.50; Emacs lucid segfaults when X dies

[Eli Zaretskii]

> Cc: luangruo@yahoo.com
> From: Visuwesh <visuweshm@gmail.com>
> Date: Wed, 13 Jul 2022 18:36:18 +0530
> 
> [Wednesday July 13, 2022] Po Lu via "Bug reports for GNU Emacs, the Swiss 
> army knife of text editors" wrote:
> 
> > Thanks.  Please see if the bug is now fixed on master.
> 
> Unfortunately, Emacs still dies on me.  Backtrace follows,

selected-frame is nil.