update ->init_request and ->exit_request prototypes

[Christoph Hellwig]

On Thu, Apr 27, 2017 at 07:44:56PM +0200, Christoph Hellwig wrote:
> Hi Jens,
> 
> this series (against for-4.12/post-merge) updates the blk-mq
> ->init_request and ->exit request methods to drop a now harmful
> parameter, and update one to pass a little more information.  It
> then cleans up the nvme drivers based on that.

Turns out that while Jeff was right that this won't work against
for-4.12/post-merge, it applies without fuzz and works fine against
for-next.  Sorry for the confusion.