For bootstat_get_last, don't complain about non-existent events. Requested events are converted into files to be processed by 'tail -1'. If the file doesn't exist, tail complains. We don't want the complaint, because this command is meant to be used to test for non-existent events. BUG=chromium-os:32203 TEST=run the test from the bug report Change-Id: I0c76f531e84ad71470394793cc1e2cdfe977e3df Reviewed-on: https://gerrit.chromium.org/gerrit/26271 Reviewed-by: Daniel Erat <[email protected]> Tested-by: Richard Barnette <[email protected]> Commit-Ready: Richard Barnette <[email protected]> Reviewed-by: Kees Cook <[email protected]>