OSV-2026-822 Heap-use-after-free in slice_segment_header::operator=

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=517027630 Crash type: Heap-use-after-free READ 4 Crash state: slicesegmentheader::operator= slicesegmentheader::read decodercontext::readsliceNAL...