OSV-2020-66 Heap-buffer-overflow in CPLErr GDALResampleChunk32R_AverageT<unsigned char, int>

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=21558 Crash type: Heap-buffer-overflow READ 1 Crash state: CPLErr GDALResampleChunk32RAverageT GDALResampleChunk32RAverage GDALRasterBand::RasterIOResampled...