[Xcb] XCB warning cleanup

[Julien Danjou]

Hi,

I've rebuild libxcb with a bunch of useful -W flag to track down some
warnings. AFAICT most of them are cosmetics, maybe one of two is a
potential bug or build fix.

If anyone can review them, I'd be happy. It should not take long.

Cheers,
-- 
Julien Danjou
// ᐰ <julien at danjou.info>   http://julien.danjou.info
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