OSV-2020-2004 Use-of-uninitialized-value in grk::t1_ht::T1HT::postDecode

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=26206 Crash type: Use-of-uninitialized-value Crash state: grk::t1ht::T1HT::postDecode grk::T1Decoder::decompressBlock grk::T1Decoder::decompress...