[PATCH] Massive clean-up to MGA server-side DRI code

[Ian Romanick]

Here's a largely "cosmetic" patch for the MGA server-side DRI code.
This is something of a "pre-patch" before I send out the patch for
bugzilla #3259 (MGA: Add support for PCI cards).

If people are okay with these changes, I'll go ahead and commit them,
and then I'll send out the *real* 3259 patch right quick.

I have attached my intended CVS log and the patch itself.
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