vhost: make destroy callback on reset owner message

QEMU sends VHOST_RESET_OWNER first when shutting down.
There was previously no way for the dataplane to know that the
virtio_net instance had become unusable and it would segfault
when trying to do RX/TX.

Signed-off-by: Rich Lane <rich.lane@bigswitch.com>
Acked-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>

lib/librte_vhost/virtio-net.c

@@ -436,6 +436,9 @@ reset_owner(struct vhost_device_ctx ctx)
 	if (dev == NULL)
 		return -1;
 
+	if (dev->flags & VIRTIO_DEV_RUNNING)
+		notify_ops->destroy_device(dev);
+
 	device_fh = dev->device_fh;
 	cleanup_device(dev);
 	init_device(dev);