[Xcb] Tiny cleanup patch that removes some code duplication

[Julien Danjou]

At 1221406920 time_t, Henning Sten wrote:
> Thanks Julien. I already saw the branch (and it's diff compared to xcb-util master) but I didn't understand how it impacted my patch? He didn't modify the demos so I guess maybe you mean that arnaud introduced some API that is better suited for what my patch did, or? (I'm completely new to XCB and X..org)

No sorry, I misread your patch and I though it was against icccm code.
Forget what I said.

I'll take a look and will push it if it's ok.

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