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>
diff --git a/drivers/scsi/aic7xxx/aic7xxx_osm.c b/drivers/scsi/aic7xxx/aic7xxx_osm.c
index a6a27d5..8836011 100644
--- a/drivers/scsi/aic7xxx/aic7xxx_osm.c
+++ b/drivers/scsi/aic7xxx/aic7xxx_osm.c
@@ -1336,7 +1336,7 @@
 	switch ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED))) {
 	case AHC_DEV_Q_BASIC:
 	case AHC_DEV_Q_TAGGED:
-		scsi_adjust_queue_depth(sdev,
+		scsi_change_queue_depth(sdev,
 				dev->openings + dev->active);
 	default:
 		/*
@@ -1345,7 +1345,7 @@
 		 * serially on the controller/device.  This should
 		 * remove some latency.
 		 */
-		scsi_adjust_queue_depth(sdev, 2);
+		scsi_change_queue_depth(sdev, 2);
 		break;
 	}
 }