cmd/gerritbot: followup on comments not addressed in 76374
cmd/gerritbot: followup on comments not addressed in 76374

Accidentally submitted before these changes were uploaded.

Update: golang/go#18517

Change-Id: I7da7248b35f3605748595985129a7f011785aa4e
Reviewed-on: https://go-review.googlesource.com/78855
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

golang/build,golang/build,golang/build,golang/build