block: Initialize max_dev_sectors to 0

block: Initialize max_dev_sectors to 0

Orabug: 23615929

(commit 5f009d3f8e6685fe8c6215082c1696a08b411220 of upstream)
The new queue limit is not used by the majority of block drivers, and
should be initialized to 0 for the driver's requested settings to be used.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
Signed-off-by: Joe Jin <joe.jin@oracle.com>