repo: fix unused variable usage
repo: fix unused variable usage

The refactoring here left behind a variable reference that no
longer exists.  Clean it up.

Bug: https://crbug.com/gerrit/11144
Change-Id: Ifdb7918b37864c48f3deef27c8bae3f793275d35
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/236613
Reviewed-by: David Pursehouse <e7b5c6a4a3dbaca972851f8c075e19915752593f@collab.net>
Tested-by: Mike Frysinger <8f3f75c74bd5184edcfa6534cab3c13a00a2f794@google.com>

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