[autotest] Remove an unnecessary machine check

No need to verify machine again if the first verify passed in
autotest.py:_do_run.

TEST=Run dummy_Pass test.
BUG=None

Change-Id: I651c4784bb8b4648fb28d8778e93b912487e7a01
Reviewed-on: https://chromium-review.googlesource.com/243596
Reviewed-by: Fang Deng <fdeng@chromium.org>
Tested-by: Fang Deng <fdeng@chromium.org>
Commit-Queue: Fang Deng <fdeng@chromium.org>
2 files changed