vhost-user: add unregister_savevm when vhost-user cleanup

Signed-off-by: Jinhua Cao <caojinhua1@huawei.com>

vhost-user-add-unregister_savevm-when-vhost-user-cle.patch

@@ -0,0 +1,33 @@
+From a9459c849c5484a022f67a317b72de764c84c845 Mon Sep 17 00:00:00 2001
+From: Jinhua Cao <caojinhua1@huawei.com>
+Date: Thu, 10 Feb 2022 20:21:33 +0800
+Subject: [PATCH] vhost-user: add unregister_savevm when vhost-user cleanup
+
+Signed-off-by: Jinhua Cao <caojinhua1@huawei.com>
+---
+ hw/virtio/vhost-user.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c
+index bf6e50223c..c265e9e92c 100644
+--- a/hw/virtio/vhost-user.c
++++ b/hw/virtio/vhost-user.c
+@@ -24,6 +24,7 @@
+ #include "sysemu/cryptodev.h"
+ #include "migration/migration.h"
+ #include "migration/postcopy-ram.h"
++#include "migration/register.h"
+ #include "trace.h"
+ 
+ #include <sys/ioctl.h>
+@@ -2068,6 +2069,7 @@ static int vhost_user_backend_cleanup(struct vhost_dev *dev)
+     u->region_rb_len = 0;
+     g_free(u);
+     dev->opaque = 0;
++    unregister_savevm(NULL, "vhost-user", dev);
+ 
+     return 0;
+ }
+-- 
+2.27.0
+