scsi: iscsi: Make iscsi_unregister_transport() return void

This function always returns 0. We can make it return void to simplify the
code. Also, no caller ever checks the return value of this function.

Link: https://lore.kernel.org/r/20220616080210.18531-1-mgurtovoy@nvidia.comReviewed-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/scsi_transport_iscsi.c

@@ -4807,7 +4807,7 @@ iscsi_register_transport(struct iscsi_transport *tt)
 }
 EXPORT_SYMBOL_GPL(iscsi_register_transport);
 
-int iscsi_unregister_transport(struct iscsi_transport *tt)
+void iscsi_unregister_transport(struct iscsi_transport *tt)
 {
 	struct iscsi_internal *priv;
 	unsigned long flags;
@@ -4830,8 +4830,6 @@ int iscsi_unregister_transport(struct iscsi_transport *tt)
 	sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
 	device_unregister(&priv->dev);
 	mutex_unlock(&rx_queue_mutex);
-
-	return 0;
 }
 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
 

include/scsi/scsi_transport_iscsi.h

@@ -162,7 +162,7 @@ struct iscsi_transport {
  * transport registration upcalls
  */
 extern struct scsi_transport_template *iscsi_register_transport(struct iscsi_transport *tt);
-extern int iscsi_unregister_transport(struct iscsi_transport *tt);
+extern void iscsi_unregister_transport(struct iscsi_transport *tt);
 
 /*
  * control plane upcalls