[Xcb] API spec failure: XCBPollEvent

[Jamey Sharp]

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XCBPollEvent has no means by which it can report I/O errors, and I can
make XCL apps spin calling it by killing the X server.

I wanted XCBPollEvent to have the same type signature as XCBWaitEvent,
where a null pointer returned unambiguously means an error occured. That
won't do here.

Any suggestions?
--=20
Jamey Sharp <jamey@minilop.net> - http://minilop.net/

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