scsi: target: loop, usb, vhost, xen: use target_remove_session

This converts drivers that were only calling transport_deregister_session
to use target_remove_session. The calling of
transport_deregister_session_configfs via target_remove_session for these
types of drivers is ok, because they were not exporting info from fields
like sess_acl_list, sess->se_tpg and sess->fabric_sess_ptr from configfs
accessible functions, so they will see no difference.

Signed-off-by: Mike Christie <mchristi@redhat.com>
Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Felipe Balbi <balbi@kernel.org>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/target/loopback/tcm_loop.c

@@ -805,7 +805,7 @@ static int tcm_loop_drop_nexus(
 	/*
 	 * Release the SCSI I_T Nexus to the emulated Target Port
 	 */
-	transport_deregister_session(tl_nexus->se_sess);
+	target_remove_session(se_sess);
 	tpg->tl_nexus = NULL;
 	kfree(tl_nexus);
 	return 0;

drivers/usb/gadget/function/f_tcm.c

@@ -1638,7 +1638,7 @@ static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg)
 	/*
 	 * Release the SCSI I_T Nexus to the emulated vHost Target Port
 	 */
-	transport_deregister_session(tv_nexus->tvn_se_sess);
+	target_remove_session(se_sess);
 	tpg->tpg_nexus = NULL;
 
 	kfree(tv_nexus);

drivers/vhost/scsi.c

@@ -1797,7 +1797,7 @@ static int vhost_scsi_drop_nexus(struct vhost_scsi_tpg *tpg)
 	/*
 	 * Release the SCSI I_T Nexus to the emulated vhost Target Port
 	 */
-	transport_deregister_session(tv_nexus->tvn_se_sess);
+	target_remove_session(se_sess);
 	tpg->tpg_nexus = NULL;
 	mutex_unlock(&tpg->tv_tpg_mutex);
 

drivers/xen/xen-scsiback.c

@@ -1576,7 +1576,7 @@ static int scsiback_drop_nexus(struct scsiback_tpg *tpg)
 	/*
 	 * Release the SCSI I_T Nexus to the emulated xen-pvscsi Target Port
 	 */
-	transport_deregister_session(tv_nexus->tvn_se_sess);
+	target_remove_session(se_sess);
 	tpg->tpg_nexus = NULL;
 	mutex_unlock(&tpg->tv_tpg_mutex);