Fix invalid output buffer usage

This patch fixes the internal AudioCoder output buffer setting to be set
prior it will be used within callback from ACM

BUG=webrtc:7462

Review-Url: https://codereview.webrtc.org/2806933002
Cr-Commit-Position: refs/heads/master@{#17800}
diff --git a/AUTHORS b/AUTHORS
index 627eab7..6527da8 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -44,11 +44,11 @@
 Sarah Thompson <sarah@telergy.com>
 Saul Kravitz <Saul.Kravitz@celera.com>
 Silviu Caragea <silviu.cpp@gmail.com>
+Stefan Gula <steweg@gmail.com>
 Steve Reid <sreid@sea-to-sky.net>
 Vladimir Beloborodov <VladimirTechMan@gmail.com>
 Vicken Simonian <vsimon@gmail.com>
 Victor Costan <costan@gmail.com>
-Stefan Gula <steweg@gmail.com>
 
 &yet LLC <*@andyet.com>
 Agora IO <*@agora.io>