Open code elevator_exit in it's only caller, and rename __elevator_exit to
elevator_exit.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20211123185312.1432157-3-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>