toolchani-utils: clean lint warning for binary_search_perforce.py

BUG=chromium:567921
TEST=binary_search_perforce.py is lint clean.

Change-Id: Ib77e93f719df0de740e8954c67de40fd754dd245
Reviewed-on: https://chrome-internal-review.googlesource.com/242505
Commit-Ready: Yunlian Jiang <yunlian@google.com>
Tested-by: Yunlian Jiang <yunlian@google.com>
Reviewed-by: Han Shen <shenhan@google.com>
1 file changed