OSV-2020-76 Heap-use-after-free in pixAverageRasterScans

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=22760 Crash type: Heap-use-after-free READ 1 Crash state: pixAverageRasterScans pixExtractBarcodeCrossings pixExtractBarcodeWidths1...