Don't do radeon_cp_dispatch flip on lastclose.

Sometimes the sarea isn't there and screws us. The intention of this
call was to set the scanout buffer back to being correct.

On the other hand: If we're in lastclose the xserver is shutting and
thus the scanout buffer is moot. Kernel modesetting will probably
revising pageflipping, but that'll be a different interface anyway.
Since all lastclose does not is call radeon_do_release() just rename
radeon_do_release to lastclose and nuke the old one.

Uwe@ has some crashes in here occasionally, this diff fixed them for him.

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