OSV-2026-733 Use-of-uninitialized-value in JBIG2Stream::readSymbolDictSeg

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=512468082 Crash type: Use-of-uninitialized-value Crash state: JBIG2Stream::readSymbolDictSeg JBIG2Stream::readSegments JBIG2Stream::rewind...