This was found to be uninitialized by an internal MSAN bot.
Bug: b/276318905
Change-Id: I0f0742113b6a5eba10ec6f51072510c91bf5676b
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/301401
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Auto-Submit: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#39871}