blk-mq: Fix memory leak in blk_mq_init_allocated_queue error handling

mainline inclusion
from mainline-v5.4-rc1
commit 73d9c8d4
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5NC63


CVE: NA

--------------------------------

If blk_mq_init_allocated_queue->elevator_init_mq fails, need to release
the previously requested resources.

Fixes: d3484991 ("blk-mq-sched: allow setting of default IO scheduler")
Signed-off-by: zhengbin <zhengbin13@huawei.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Jason Yan <yanaijie@huawei.com>
Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com>