bswap-cleanup v2

[Matt Turner]

Hi
Preceding this is version 2 of my bswap clean-up patches.

They're split into the very small, easily reviewable (and bisectable) patches.

As before, they're available in my git repo:
http://cgit.freedesktop.org/~mattst88/xserver/log/?h=bswap-cleanup2

The first patch wasn't sent to the list due to its size, but again,
it's a Coccinelle-automated patch with manual removal of left-over
variables.

Thanks for reviewing,
Matt