tree debe5def1616fef1b722b65a54029a4f9dbd3f1f
parent bc82f2d643f3d6e2a7692efa38c92fa275196274
author Andrew Scull <ascull@google.com> 1549030339 +0000
committer Andrew Scull <ascull@google.com> 1550855328 +0000

Make mailbox clearing idempotent.

Change-Id: Ib07df13119eee7b4d916688bdb68a0760aedccaa