nvme: remove a spurious clear of discard_alignment

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2083917



commit 4e7f0ece
Author: Christoph Hellwig <hch@lst.de>
Date:   Mon Apr 18 06:53:12 2022 +0200

    nvme: remove a spurious clear of discard_alignment

    The nvme driver never sets a discard_alignment, so it also doens't need
    to clear it to zero.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
    Link: https://lore.kernel.org/r/20220418045314.360785-10-hch@lst.de


Signed-off-by: Jens Axboe <axboe@kernel.dk>

Signed-off-by: Ming Lei <ming.lei@redhat.com>