enc_qsv: general cleanup.

Mainly:

 - coding style
 - formatting
 - indentation

Also:

 - fix two warnings
 - remove unnecessary header
 - remove unused parameter in parse_nalus


git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@6145 b64f7644-9d1e-0410-96f1-a4d463321fa5