A device lost event would improperly skip returning an error, which
could lead us down a code path that would read/write to invalid
locations.

BUG=519642

Change-Id: Iba437b9b24cdf44320a944a85146f5f73be9f7a6
Reviewed-on: https://chromium-review.googlesource.com/293903Tested-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>