[PATCH xcb] don't flag extra reply in xcb_take_socket

[Michal Srb]

On čtvrtek 9. srpna 2018 0:20:01 CEST Erik Kurzinger wrote:
> In practice, this has been causing intermittent KWin crashes when
> used in combination with the proprietary NVIDIA driver such as
> https://bugs.kde.org/show_bug.cgi?id=386370 since when Xlib fails to
> retrieve one of these incorrectly discarded replies it triggers
> an IO error.

There is a downstream bug with the same issue:
https://bugzilla.opensuse.org/show_bug.cgi?id=1101560

I have let the reporter try libxcb with this patch and reportedly it fixed the 
issue for him. Not sure if it can be used as Tested-by, but positive feedback 
nevertheless!

Michal