block: get rid of on-stack plugging debug checks
authorJens Axboe <jaxboe@fusionio.com>
Fri, 20 May 2011 18:52:16 +0000 (20:52 +0200)
committerJens Axboe <jaxboe@fusionio.com>
Fri, 20 May 2011 18:52:16 +0000 (20:52 +0200)
We don't need them anymore, so kill:

- REQ_ON_PLUG checks in various places
- !rq_mergeable() check in plug merging

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

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