vhost-vdpa: don't cleanup twice in vhost_vdpa_add()

vhost-vdpa: don't cleanup twice in vhost_vdpa_add()

The previous vhost_net_cleanup is sufficient for freeing, calling
vhost_vdpa_del() in this case will lead an extra round of free. Note
that this kind of "double free" is safe since vhost_dev_cleanup() zero
the whole structure.

Reviewed-by: Stefano Garzarella <[email protected]>
Signed-off-by: Jason Wang <[email protected]>
Message-Id: <20210903091031[email protected]>
Reviewed-by: Michael S. Tsirkin <[email protected]>
Signed-off-by: Michael S. Tsirkin <[email protected]>