vsock/virtio: mark an internal function static

virtio_transport_alloc_pkt is only used locally, make it static.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

net/vmw_vsock/virtio_transport_common.c

@@ -32,7 +32,7 @@ static const struct virtio_transport *virtio_transport_get_ops(void)
 	return container_of(t, struct virtio_transport, transport);
 }
 
-struct virtio_vsock_pkt *
+static struct virtio_vsock_pkt *
 virtio_transport_alloc_pkt(struct virtio_vsock_pkt_info *info,
 			   size_t len,
 			   u32 src_cid,
@@ -82,7 +82,6 @@ virtio_transport_alloc_pkt(struct virtio_vsock_pkt_info *info,
 	kfree(pkt);
 	return NULL;
 }
-EXPORT_SYMBOL_GPL(virtio_transport_alloc_pkt);
 
 static int virtio_transport_send_pkt_info(struct vsock_sock *vsk,
 					  struct virtio_vsock_pkt_info *info)