build_artifact: Fix lint errors.

BUG=chromium:403086
TEST=cros flash --debug --clear-cache ssh://100.107.71.157 xBuddy://remote/chell-release/R79-12539.0.0

Change-Id: Iccc786c0a3418633efa65720e8d944c5aeaeb9ae
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/1827158
Tested-by: Achuith Bhandarkar <achuith@chromium.org>
Reviewed-by: Amin Hassani <ahassani@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Sean Abraham <seanabraham@chromium.org>
2 files changed