that was not updated as it should.
The bug caused no negative impact at all apart
from a missed check that the Aec handles above
index 0 were not null. That check is, however,
done elsewhere so there was no negative impact
of this bug.
BUG=
Review URL: https://codereview.webrtc.org/1716203002
Cr-Commit-Position: refs/heads/master@{#11863}