Fix a bug in BQ24192 charger driver
Fix a bug in BQ24192 charger driver

BUG=chrome-os-partner:22238
TEST=Check the return value is EC_SUCCESS
BRANCH=None

Change-Id: I6010d3f8b55938c5fc6526776bee536868a96b55
Signed-off-by: Vic Yang <5fd92abeee651458f98e2856f4f200ee971cee4d@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/168733
Reviewed-by: Vincent Palatin <70a9964ec8fd10b0b08fcc8623c2add25ddf99ac@chromium.org>
Reviewed-by: Randall Spangler <62698fdbb84d1779579ee80c3f39fac22017e5bc@chromium.org>

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