block: ensure that the timer is always added
authorJens Axboe <axboe@fb.com>
Fri, 30 May 2014 21:41:39 +0000 (15:41 -0600)
committerJens Axboe <axboe@fb.com>
Fri, 30 May 2014 21:41:39 +0000 (15:41 -0600)
Commit f793aa537866 relaxed the timer addition a little too much.
If the timer isn't pending, we always need to add it.

Signed-off-by: Jens Axboe <axboe@fb.com>

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