all: address vet reports

Fixes various problems reported by go vet.

Change-Id: I12a6fdba8f911b21805d8e42903f8f6a5033790a
Reviewed-on: https://go-review.googlesource.com/2163
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
1 file changed
tree: cbb7c2be1f3fab3d4f6919dc2a7386a96e28f565
  1. app/
  2. builder/
  3. coordinator/
  4. env/
  5. retrybuilds/
  6. updater/
  7. watcher/
  8. README