lib21: Close the open file when finished using it

BUG=none
BRANCH=ToT
TEST=make runtests

Change-Id: Ie4ac1ae71e70b62f9bc89fa1441ff5ca65199f79
Signed-off-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/244673
Reviewed-by: Randall Spangler <rspangler@chromium.org>
1 file changed