[SCSI] libsas: convert dev->gone to flags

In preparation for adding tracking of another device state "destroy".

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
diff --git a/drivers/scsi/libsas/sas_port.c b/drivers/scsi/libsas/sas_port.c
index a47c7a7..d88e55f 100644
--- a/drivers/scsi/libsas/sas_port.c
+++ b/drivers/scsi/libsas/sas_port.c
@@ -171,7 +171,7 @@
 
 	if (port->num_phys == 1) {
 		if (dev && gone)
-			dev->gone = 1;
+			set_bit(SAS_DEV_GONE, &dev->state);
 		sas_unregister_domain_devices(port);
 		sas_port_delete(port->port);
 		port->port = NULL;