OSV-2024-1031 Use-of-uninitialized-value in Http3FrameFactory::create

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=42537939 Crash type: Use-of-uninitialized-value Crash state: Http3FrameFactory::create Http3FrameFactory::fastcreate fuzzhttp3frame.cc...