ensure_not_tainted_license: skip if not found

This change makes ensure_not_tainted_license.sh only emit a warning if
license file is not found, as opposed to failing.

BUG=chromium:1163996
TEST=N/A
BRANCH=none

Change-Id: I14103bc520efabf3e0c1424e8a5cae259d42c966
Signed-off-by: Sergey Frolov <sfrolov@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/2632876
Commit-Queue: George Engelbrecht <engeg@google.com>
Reviewed-by: George Engelbrecht <engeg@google.com>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
1 file changed