gdal/gdal_filesystem_fuzzer: Bad-cast to JPGDataset from JPGDataset12 in JPGRasterBand::GetMaskBand

Project: https://github.com/OSGeo/gdal.git Detailed report: https://oss-fuzz.com/testcase?key=6540028084748288 Project: gdal Fuzzer: libFuzzergdalfilesystemfuzzer Fuzz target binary: gdalfilesystemfuzzer Job Type: libfuzzerubsangdal Platform Id: linux Crash Type: Bad-cast Crash Address:...