OSV-2020-1830 Heap-use-after-free in grk::TileProcessor::~TileProcessor

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=25873 Crash type: Heap-use-after-free READ 8 Crash state: grk::TileProcessor::TileProcessor grk::CodeStream::decompresstiles grk::CodeStream::dodecompress...