Battery interface over host command is different, as it allows
negative current values to indicate discharge, let's not fail in
that case.
BRANCH=none
BUG=b:65697620
TEST=ectool battery 1 does not fail when battery is discharging.
Change-Id: I89ca750e24706f55a0589201aeaf9fea50f3132f
Signed-off-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/869552
Reviewed-by: Randall Spangler <rspangler@chromium.org>