elevator: fix unnecessary put of elevator in failure case
We already checked that e is NULL, so no point in calling elevator_put() to free it. Reported-by: NDan Carpenter <dan.carpenter@oracle.com> Fixes: dc877dbd088f ("blk-mq-sched: add framework for MQ capable IO schedulers") Signed-off-by: NJens Axboe <axboe@fb.com>
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