enc_qsv: simplify encqsvClose.


git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@6146 b64f7644-9d1e-0410-96f1-a4d463321fa5
enc_qsv: simplify qsv_enc_init.


git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@6147 b64f7644-9d1e-0410-96f1-a4d463321fa5
enc_qsv: cleanup encoding loop, part 1.

Mainly:

 - allocate frame surface data in qsv_enc_init
 - setup input frame surface outside the loop
 - remove unnecessary variable
 - handle errors via a common path


git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@6148 b64f7644-9d1e-0410-96f1-a4d463321fa5
enc_qsv: cleanup encoding loop, part 2.

Move related code to separate functions whenever
possible; simplify or improve the code where applicable.


git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@6149 b64f7644-9d1e-0410-96f1-a4d463321fa5
enc_qsv: cleanup encoding loop, part 3.

Move encoding loop to its own function and simplify encqsvWork.


git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@6150 b64f7644-9d1e-0410-96f1-a4d463321fa5