OSV-2020-1158 Use-of-uninitialized-value in JBIG2HuffmanDecoder::buildTable

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=18802 Crash type: Use-of-uninitialized-value Crash state: JBIG2HuffmanDecoder::buildTable JBIG2Stream::readTextRegionSeg JBIG2Stream::readSegments...