-Moved memsets to where their variables are used.
-Removed redundant.
-Changed a pointer scalar to be accessed in pointer notation rather than
in array notation.
The change has been tested for bitexactness.
BUG=webrtc:5201
Review URL: https://codereview.webrtc.org/1494473006
Cr-Commit-Position: refs/heads/master@{#10963}