Parser crash via truncated minidump descriptor array

Out-of-bounds read in radare2 6.1.0 through 6.1.6 allows local users to crash the parser with a crafted minidump. The Memory64ListStream parser in libr/bin/format/mdmp/mdmp.c bounds descriptor iteration by the whole file rather than the stream's declared DataSize, so it consumes following bytes as descriptors. A local low-privileged user must cause radare2 or rabin2 to parse the malformed file; the grounded consequence is application interruption, not data disclosure or modification.