Various cleanups for amdgpu_dm

[Harry Wentland]

Thanks for these cleanups.

Some of these could possibly squashed but then, I generally
prefer smaller changes than one big lump.

Reviewed-by: Harry Wentland <harry.wentland at amd.com>

Harry

On 2017-10-17 12:18 PM, Tom St Denis wrote:
> Various cleanups to indentation/braces as well as a couple of
> simplifications.  Mostly NFC but there are a couple of patches with
> trivial functional changes (#6, #8) 
> 
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