vhost_vsock: simplify vhost_vsock_flush()

vhost_vsock_flush() calls vhost_work_dev_flush(vsock->vqs[i].poll.dev)
before vhost_work_dev_flush(&vsock->dev). This seems pointless
as vsock->vqs[i].poll.dev is the same as &vsock->dev and several flushes
in a row doesn't do anything useful, one is just enough.

Signed-off-by: Andrey Ryabinin <arbn@yandex-team.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Mike Christie <michael.christie@oracle.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20220517180850.198915-6-michael.christie@oracle.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

drivers/vhost/vsock.c

@@ -705,11 +705,6 @@ out:
 
 static void vhost_vsock_flush(struct vhost_vsock *vsock)
 {
-	int i;
-
-	for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++)
-		if (vsock->vqs[i].handle_kick)
-			vhost_work_dev_flush(vsock->vqs[i].poll.dev);
 	vhost_work_dev_flush(&vsock->dev);
 }