Ignore xenbus system state transitions on shutdown

diff -r 138bfca44447 drivers/xen/xenbus/xenbus_probe.c
@@ -208,6 +208,7 @@ static void otherend_changed(struct xenb
 	DPRINTK("state is %d (%s), %s, %s", state, xenbus_strstate(state),
 		dev->otherend_watch.node, vec[XS_WATCH_PATH]);
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
 	/*
 	 * Ignore xenbus transitions during shutdown. This prevents us doing
 	 * work that can fail e.g., when the rootfs is gone.

@@ -221,6 +222,7 @@ static void otherend_changed(struct xenb
 			xenbus_frontend_closed(dev);
 		return;
 	}
+#endif
 
 	if (drv->otherend_changed)
 		drv->otherend_changed(dev, state);