Fix undefined behavior in FrameBuffer
Fix undefined behavior in FrameBuffer

Bug: none
Change-Id: I7ce6298a27dc9e79e5f5a85103b3f1dd7b4be71e
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/131953
Commit-Queue: Ilya Nikolaevskiy <76788ac3efd229e9d156135d9ceb7fef65c45da4@webrtc.org>
Reviewed-by: Danil Chapovalov <55de8d9c2b5977da2dd48f967f21f9d606b172a5@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#27527}
ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc