[Xcb] [Bug 29599] hang in xcb_request_check() due to expecting a reply on void request

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=29599

--- Comment #2 from Havoc Pennington <hp at pobox.com> 2010-08-16 21:11:02 PDT ---
Created an attachment (id=37905)
 View: https://bugs.freedesktop.org/attachment.cgi?id=37905
 Review: https://bugs.freedesktop.org/review?bug=29599&attachment=37905

improve xcb_request_check docs

I think xcb_request_check() docs assumed a bit too much, here's a patch to
spell things out more.

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