OSV-2021-1287 Use-of-uninitialized-value in piex::image_type_recognition::ContainsNikonSignatures

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=38799 Crash type: Use-of-uninitialized-value Crash state: piex::imagetyperecognition::ContainsNikonSignatures piex::imagetyperecognition::NefTypeChecker::IsMyType piex::imagetyperecognition::RecognizeRawImageTypeLite...