Perform a lazy umount.

The umount was failing on some systems. Performing a -l seems
to fix the issue.

BUG=None
TEST=manual run

Change-Id: I66dd1ca987de6769c81c88bc6c936a26d72a6bb5
Reviewed-on: https://gerrit.chromium.org/gerrit/36062
Tested-by: Yusuf Mohsinally <mohsinally@chromium.org>
Reviewed-by: Gediminas Ramanauskas <gedis@chromium.org>
Tested-by: Gediminas Ramanauskas <gedis@chromium.org>
Reviewed-by: Tom Wai-Hong Tam <waihong@chromium.org>
1 file changed