buildbot_utils: fix a typo.

BUG=None
TEST=None.

Change-Id: Ib0ba6a3cf9bee432b93dc2b96f96e2c4c8a8944d
Reviewed-on: https://chromium-review.googlesource.com/1007488
Commit-Ready: Yunlian Jiang <yunlian@chromium.org>
Tested-by: Yunlian Jiang <yunlian@chromium.org>
Reviewed-by: Yunlian Jiang <yunlian@chromium.org>
1 file changed