[DEV] fix arm64 SIGSEGV, vsnprintf return number chars that would have been written
[DEV] fix arm64 SIGSEGV, vsnprintf return number chars that would have been written

Change-Id: I04aee1e9690946ed49f7930420f8ffbb14f678c0
Reviewed-on: https://gerrit.parrot.biz/57882
Reviewed-by: Jean-Baptiste Dubois <3904e157e51b6776698fd1c0b3e878d58932a523@parrot.com>

Parrot-Developers/libARSAL,Parrot-Developers/libARSAL,Parrot-Developers/libARSAL