scsi: libiscsi: convert change of struct iscsi_conn to fix KABI

hulk inclusion
category: bugfix
bugzilla: 46895
CVE: NA
---------------------------
Signed-off-by: Nyangerkun <yangerkun@huawei.com>
Reviewed-by: NJason Yan <yanaijie@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>
Signed-off-by: NCheng Jian <cj.chengjian@huawei.com>

include/scsi/libiscsi.h

@@ -200,7 +200,7 @@ struct iscsi_conn {
 	struct iscsi_task	*task;		/* xmit task in progress */
 
 	/* xmit */
-	/* items must be added/deleted under frwd lock */
+	spinlock_t              taskqueuelock;  /* protects the next three lists */
 	struct list_head	mgmtqueue;	/* mgmt (control) xmit queue */
 	struct list_head	cmdqueue;	/* data-path cmd queue */
 	struct list_head	requeue;	/* tasks needing another run */