Fix lint errors in afe_lock_machine.py

BUG=None
TEST=Ran crosperf with newly formatted file.

Change-Id: I998b75761281a1ce9b0af8f606b47be8b8ca6aee
Reviewed-on: https://chrome-internal-review.googlesource.com/241175
Commit-Ready: Caroline Tice <cmtice@google.com>
Tested-by: Caroline Tice <cmtice@google.com>
Reviewed-by: Caroline Tice <cmtice@google.com>
1 file changed