firewire: fw-sbp2: default to 128k transfers

because that's what the old sbp2 driver does per default, to avoid
trouble with buggy devices.

A test on a 1394b hardware RAID0 shows a drop in bandwidth by 10% by
this patch.
---
This should not be hardwired but set by blk_queue_max_sectors() in
sbp2_scsi_slave_configure().

 drivers/firewire/fw-sbp2.c |    1 +
 1 file changed, 1 insertion(+)

Index: linux-2.6.22/drivers/firewire/fw-sbp2.c
===================================================================
--- linux-2.6.22.orig/drivers/firewire/fw-sbp2.c
+++ linux-2.6.22/drivers/firewire/fw-sbp2.c
@@ -1171,6 +1171,7 @@ static struct scsi_host_template scsi_dr
 	.this_id		= -1,
 	.sg_tablesize		= SG_ALL,
 	.use_clustering		= ENABLE_CLUSTERING,
+	.max_sectors		= 255,
 	.cmd_per_lun		= 1,
 	.can_queue		= 1,
 	.sdev_attrs		= sbp2_scsi_sysfs_attrs,