scsi: drop reason argument from ->change_queue_depth

Drop the now unused reason argument from the ->change_queue_depth method.
Also add a return value to scsi_adjust_queue_depth, and rename it to
scsi_change_queue_depth now that it can be used as the default
->change_queue_depth implementation.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Reviewed-by: Hannes Reinecke <hare@suse.de>

drivers/scsi/scsi_sysfs.c

@@ -880,8 +880,7 @@ sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
 	if (depth < 1 || depth > sht->can_queue)
 		return -EINVAL;
 
-	retval = sht->change_queue_depth(sdev, depth,
-					 SCSI_QDEPTH_DEFAULT);
+	retval = sht->change_queue_depth(sdev, depth);
 	if (retval < 0)
 		return retval;