patch for bug #18222

[Matthieu Herrb]

Hi,

it appears that the chips&technologies X driver was partially broken
during libpciaccess conversion. Thanks to analysis by Marien Swart in X.Org
bugzilla 18122 and a similar fix by Mark Kettenis for the radeon driver,
I think this patch should fix it.

So if you have a machine with a C&T VGA card in it, I'd appreciate if
you could try the attached patch or otherwise review it.
-- 
Matthieu Herrb

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