BUG=libyuv:809

Change-Id: I75afb5612dcd05820479848a90ad16b07a7981bc
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/1707229Reviewed-by: richard winterton <rrwinterton@gmail.com>
Commit-Queue: Frank Barchard <fbarchard@chromium.org>