bug#41239: GTK builds crashing in XTread_socket after deleting a frame

[Eli Zaretskii]

> Cc: 41239@debbugs.gnu.org
> From: martin rudalics <rudalics@gmx.at>
> Date: Fri, 22 May 2020 11:31:17 +0200
> 
>  > The patch below seems to fix it.
> 
> It fixes the crash and I think you should apply it.

I agree.

Thanks.