FROMGIT: block: mq-deadline: Fix handling of at-head zoned writes

Before dispatching a zoned write from the FIFO list, check whether there
are any zoned writes in the RB-tree with a lower LBA for the same zone.
This patch ensures that zoned writes happen in order even if at_head is
set for some writes for a zone and not for others.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Cc: Ming Lei <ming.lei@redhat.com>
Change-Id: I51a3faf0f2dbca7f860cb7fdc103d077a6a97d0a
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20230517174230.897144-12-bvanassche@acm.org


Signed-off-by: Jens Axboe <axboe@kernel.dk>
Bug: 275581839
(cherry picked from commit a036e698 https://git.kernel.dk/cgit/linux/

)
Signed-off-by: Bart Van Assche <bvanassche@google.com>