OSV-2025-955 Use-of-uninitialized-value in decoder_context::construct_reference_picture_lists

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=464323256 Crash type: Use-of-uninitialized-value Crash state: decodercontext::constructreferencepicturelists decodercontext::processslicesegmentheader decodercontext::readsliceNAL...