OSV-2018-231 Use-of-uninitialized-value in rawspeed::RawImageData::checkMemIsInitialized

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5843 Crash type: Use-of-uninitialized-value Crash state: rawspeed::RawImageData::checkMemIsInitialized rawspeed::RawDecoder::decodeRaw rawspeed::alignedMalloc...