gdal/cad_fuzzer: Bad-cast to CADAttdef from CADAttrib in CADLayer::addHandle

Project: https://github.com/OSGeo/gdal.git Detailed report: https://oss-fuzz.com/testcase?key=6413960052998144 Project: gdal Fuzzer: libFuzzergdalcadfuzzer Fuzz target binary: cadfuzzer Job Type: libfuzzerubsangdal Platform Id: linux Crash Type: Bad-cast Crash Address: 0x000008164350 Crash State:...