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This ensures deterministic failure if the setsockopt() implementation
tries to make use of otherwise uninitialized fields.

Bug: 862189
Change-Id: I0be1dd6c9b830babf0911dc0d78910a20cbd0813
Reviewed-on: https://chromium-review.googlesource.com/1136374Reviewed-by: Asanka Herath <asanka@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#574943}