[SCSI] iscsi class: user device_for_each_child instead of duplicating session list

Currently we duplicate the list of sessions, because we were using the
test for if a session was on the host list to indicate if the session
was bound or unbound. We can instead use the target_id and fix up
the class so that drivers like bnx2i do not have to manage the target id
space.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index 33cd0ca..aa3c7f0 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -1868,7 +1868,7 @@
 
 	cls_session = iscsi_session_setup(&iscsi_tcp_transport, shost, cmds_max,
 					  sizeof(struct iscsi_tcp_task),
-					  initial_cmdsn);
+					  initial_cmdsn, 0);
 	if (!cls_session)
 		goto remove_host;
 	session = cls_session->dd_data;