scsi: megaraid: Clear READ queue map's nr_queues

scsi: megaraid: Clear READ queue map's nr_queues

The megaraid SCSI driver sets set->nr_maps as 3 if poll_queues is > 0, and
blk-mq actually initializes each map's nr_queues as nr_hw_queues.
Consequently the driver has to clear READ queue map's nr_queues, otherwise
the queue map becomes broken if poll_queues is set as non-zero.

Link: https://lore.kernel.org/r/[email protected]
Fixes: 9e4bec5b2a23 ("scsi: megaraid_sas: mq_poll support")
Cc: Kashyap Desai <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: Hannes Reinecke <[email protected]>
Reported-by: Guangwu Zhang <[email protected]>
Tested-by: Guangwu Zhang <[email protected]>
Reviewed-by: Bart Van Assche <[email protected]>
Signed-off-by: Ming Lei <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>