Commit 968bbd5c918568eb95b493af05c464ddfc36671b

chenguolong 2020-02-04T16:05:02

event_base_once: fix potential null pointer threat supposing if base is null, EVBASE_ACQUIRE_LOCK and EVBASE_RELEASE_LOCK would get a coredump, so we add a guard for protection. Signed-off-by: chenguolong <cgl.chenguolong@huawei.com>