OSV-2020-2097 Use-of-uninitialized-value in WelsCommon::CMemoryAlign::~CMemoryAlign

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=26612 Crash type: Use-of-uninitialized-value Crash state: WelsCommon::CMemoryAlign::CMemoryAlign WelsCommon::CMemoryAlign::CMemoryAlign WelsDec::CWelsDecoder::UninitDecoderCtx...