Commit b12e5c6c accidentally changes blk_kick_flush to do a head
insert into the requeue list, fix this up.

Fixes: b12e5c6c ("blk-mq: pass a flags argument to blk_mq_add_to_requeue_list")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20230416073553.966161-1-hch@lst.deSigned-off-by: Jens Axboe <axboe@kernel.dk>