trim redundant pass statements

Clean up a few linter warnings.

Change-Id: I531d0263a202435d32d83d87ec24998f4051639c
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/297062


Reviewed-by: Jonathan Nieder <jrn@google.com>
Tested-by: Mike Frysinger <vapier@google.com>