repo: Fix warnings reported by flake8
repo: Fix warnings reported by flake8

  repo:342:5: E306 expected 1 blank line before a nested definition, found 0
  repo:617:5: F841 local variable 'ret' is assigned to but never used

Change-Id: I364fdb5dac8ebaff398b848935fe8356cb9ed2d3
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/255035
Reviewed-by: Mike Frysinger <8f3f75c74bd5184edcfa6534cab3c13a00a2f794@google.com>
Tested-by: David Pursehouse <e7b5c6a4a3dbaca972851f8c075e19915752593f@collab.net>

mer-tools/git-repo,TheQtCompany/git-repo,codetutil/git-repo,GerritCodeReview/git-repo,aosp-mirror/tools_repo,lewixliu/git-repo,codetutil/git-repo,mer-tools/git-repo,TheQtCompany/git-repo,couchbasedeps/git-repo,couchbasedeps/git-repo,lipro-yocto/git-repo,lipro-yocto/git-repo,lewixliu/git-repo,aosp-mirror/tools_repo,GerritCodeReview/git-repo