Fix bugs found by fuzzer

[touatily]

• Fixing runtime error:

negation of -2147483648 cannot be represented in type 'int'

• Check if filter field is not null also to prevent segmentation fault
• In Route dmx, update alloc_size of an object if necessary when picking it from reservoir
• Cast to u64 to avoid overflow in comparisons
• Purge segment if there are any fragments that extend beyond the total length
• Display warning message if received TOL is null

[aureliendavid]

looks good, thanks!