no argument named @xbt in xenbus_switch_state(), remove it.

Signed-off-by: Qinghuang Feng
---
diff --git a/drivers/xen/xenbus/xenbus_client.c b/drivers/xen/xenbus/xenbus_client.c
index 9678b3e..92a1ef8 100644
--- a/drivers/xen/xenbus/xenbus_client.c
+++ b/drivers/xen/xenbus/xenbus_client.c
@@ -136,7 +136,6 @@ EXPORT_SYMBOL_GPL(xenbus_watch_pathfmt);
/**
* xenbus_switch_state
* @dev: xenbus device
- * @xbt: transaction handle
* @state: new state
*
* Advertise in the store a change of the given driver to the given new_state.
@@ -267,7 +266,7 @@ EXPORT_SYMBOL_GPL(xenbus_dev_error);
* @fmt: error message format
*
* Equivalent to xenbus_dev_error(dev, err, fmt, args), followed by
- * xenbus_switch_state(dev, NULL, XenbusStateClosing) to schedule an orderly
+ * xenbus_switch_state(dev, XenbusStateClosing) to schedule an orderly
* closedown of this driver and its peer.
*/

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