Minor improvement in RoundToInt16 implementation.

R=andrew@webrtc.org, bjornv@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/8959004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@5586 4adac7df-926f-26a2-2b94-8c16560cd09d
3 files changed