[atari][media] Mem leak in DiskTypeXEX.

[tschak909]

Looks like when an XEX is mounted, some next level heap corruption occurs:

22:11:41.416 > CF: 70 d6 02 00 49
22:11:41.416 > sioFuji::sio_process() called
22:11:41.421 > ACK!
22:11:41.421 > disk UNMOUNT
22:11:41.421 > Mounting lobby server
22:11:41.421 > Resolving hostname "tnfs.fujinet.online"
22:11:41.596 > Resolved to address 104.248.6.55
22:11:41.596 > TNFS mount tnfs.fujinet.online[104.248.6.55]:16384
22:11:41.653 > TNFS mount successful. session: 0x3876, version: 0x0102, min_retry: 1000ms
22:11:41.654 > vfs_tnfs_register "/tnfs0x3ffcde20" @ 0x3ffcde20 = 0 "ESP_OK"
22:11:41.657 > opening lobby.
22:11:41.708 > TNFS open file: "/ATARI/_lobby.xex" (0x0001, 0x01b6)
22:11:41.762 > File opened, handle ID: 0, size: 13156, pos: 0
22:11:41.762 > disk MOUNT
22:11:41.762 > XEX MOUNT
22:11:41.765 > load_firmware '/picoboot.bin'
22:11:41.928 > load_firmware file size = 384
22:11:41.928 > mounted XEX with 384-byte bootloader; XEX size=0
22:11:41.931 > disk sectors = 720
22:11:41.935 > COMPLETE!
22:11:41.935 > [lib/bus/sio/sio.cpp:255] _sio_process_cmd(): Heap trace follows
22:11:41.936 > 8 allocations trace (100 entry buffer)
22:11:41.937 > 92 bytes (@ 0x3ffdd76c) allocated CPU 1 ccount 0x018f8f38 caller 0x40093c3b:0x40130854
22:11:41.939 > 12 bytes (@ 0x3ffddb90) allocated CPU 1 ccount 0x018fa444 caller 0x4013812d:0x4013088c
22:11:41.940 > 192 bytes (@ 0x3ffefab0) allocated CPU 1 ccount 0x04e1913c caller 0x40138584:0x4013865c
22:11:41.943 > 92 bytes (@ 0x3ffddbac) allocated CPU 1 ccount 0x04ebd2ac caller 0x40093c3b:0x40093f97
22:11:41.944 > 796 bytes (@ 0x3ffefc90) allocated CPU 1 ccount 0x04ec09e8 caller 0x4018ac84:0x401d966f
22:11:41.947 > 836 bytes (@ 0x3ffeffbc) allocated CPU 1 ccount 0x067352fc caller 0x4018ac84:0x400ee7f2
22:11:41.948 > 428 bytes (@ 0x3ffdd954) allocated CPU 1 ccount 0x08cc44a8 caller 0x4009a3c4:0x4008d1d2
22:11:41.950 > 384 bytes (@ 0x3fff0310) allocated CPU 1 ccount 0x08ceab58 caller 0x400f18f6:0x401d7730
22:11:41.953 > 2832 bytes 'leaked' in trace (8 allocations)
22:11:41.953 > total allocations 2240 total frees 2277