Yet another accounting bug, this time hits on requeue. It is possible
for ->accounted to be set with ->in_flight, so don't nest the
cfq_account_completion() inside the ->in_flight check.
Signed-off-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>