Fix for left-shift of potentially negative values in NetEq.

Left shifting negative integers is undefined behavior, and should be prevented. This CL fixes one such instance in the NetEq Expand function.

BUG=chromium:677106

Review-Url: https://codereview.webrtc.org/2616363003
Cr-Original-Commit-Position: refs/heads/master@{#15966}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 4843dd13aa3426d9a3caee768fc015d8731c5d18
1 file changed