Flaky test

TestSample in the styx package is flaky. See https://travis-ci.org/droyo/styx/builds/544575851?utm_source=github_status&utm_medium=notification for an example failure:

```
    server_test.go:212: 	→ 000 Tclunk fid=2
    server_test.go:30: closed connection from pipe
    server_test.go:244: the following requests were unanswered:
        000 Tclunk fid=2
```