[SCSI] iscsi_tcp: update header size during relogin

When we relogin to a target, we have not yet negotiated digests
so we must reset the hdr_size var.
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/iscsi_tcp.c

@@ -1827,9 +1827,11 @@ static void
 iscsi_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
 {
 	struct iscsi_conn *conn = cls_conn->dd_data;
+	struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 
 	iscsi_conn_stop(cls_conn, flag);
 	iscsi_tcp_release_conn(conn);
+	tcp_conn->hdr_size = sizeof(struct iscsi_hdr);
 }
 
 static int