[SCSI] iscsi: fix iscsi_endpoint leak

When iscsid restarts it does not know the connection's
endpoint, so it is getting leaked. This fixes the problem
by having the iscsi class force a disconnect before a
new connection is bound.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

include/scsi/scsi_transport_iscsi.h

@@ -160,6 +160,8 @@ struct iscsi_cls_conn {
 	void *dd_data;			/* LLD private data */
 	struct iscsi_transport *transport;
 	uint32_t cid;			/* connection id */
+	struct mutex ep_mutex;
+	struct iscsi_endpoint *ep;
 
 	int active;			/* must be accessed with the connlock */
 	struct device dev;		/* sysfs transport/container device */
@@ -222,6 +224,7 @@ struct iscsi_endpoint {
 	void *dd_data;			/* LLD private data */
 	struct device dev;
 	uint64_t id;
+	struct iscsi_cls_conn *conn;
 };
 
 /*