misc prime/modesetting fixes

[Alex Deucher]

On Fri, Apr 29, 2016 at 12:01 AM, Dave Airlie <airlied at gmail.com> wrote:
> The first patch is picked from Alex Goins' series as a cleanup,
> I then got distracted fixing other minor things I found just testing
> prime with modesetting.
>
> Finally Alex's series showed up a bug we have currently leaking
> the slave BO, his fix wasn't very symmetrical, however to make a
> nice fix I had to break the ABI by passing a NULL where we didn't
> before.

patches 1-5 are:
Reviewed-by: Alex Deucher <alexander.deucher at amd.com>

>
> Dave.
>
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