syncbase: fix various "go vet" errors

The "go vet" command I used:
v23 go vet v.io/syncbase/... 2>&1 | grep -v "vdl.go"

(will chat with Jiri/Jing to see if we can add go vet/lint to
our standard presubmit)

Change-Id: Ie5ff02590cd3d8850a54c388b0bd3b4d842832ff
4 files changed
tree: 61569e4bc78fa58028ac029b6867f3149342eb6b
  1. services/