OSV-2020-1 Use-of-uninitialized-value in numaCrossingsByThreshold

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=22764 Crash type: Use-of-uninitialized-value Crash state: numaCrossingsByThreshold numaSelectCrossingThreshold pixExtractBarcodeCrossings...