block: Drop granularity check in queue_limit_discard_alignment()

lim->discard_granularity is always at least SECTOR_SIZE, so drop the
pointless check for granularity less than SECTOR_SIZE.

Signed-off-by: John Garry <john.g.garry@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20241112092144.4059847-1-john.g.garry@oracle.com


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