project: fix variable typo

Bug: https://crbug.com/gerrit/11293


Reported-by: Daniel Kutik <daniel.kutik@lavawerk.com>
Change-Id: I37bac58aa1dc9ecc10e29253d14ff9e6fb42427c
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/298942


Reviewed-by: Ian Kasprzak <iankaz@google.com>
Tested-by: Mike Frysinger <vapier@google.com>