vhost-vdpa: fix leaking of vhost_net in vhost_vdpa_add()

Fixes: 1e0a84ea ("vhost-vdpa: introduce vhost-vdpa net client")
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20210903091031.47303-9-jasowang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

net/vhost-vdpa.c

@@ -110,6 +110,7 @@ static int vhost_vdpa_add(NetClientState *ncs, void *be)
 err:
     if (net) {
         vhost_net_cleanup(net);
+        g_free(net);
     }
     return -1;
 }