veyron/lib/websocket: Fix bug in conn_nacl.
veyron/lib/websocket: Fix bug in conn_nacl.

Unfortunately unrelated to all the other bugs.

Change-Id: Icff27d73829bf395e1edbf3e172a4c58e5bfffe2

vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref