QSysInfo::machineUniqueId() returns empty QByteArray on MacOS

the function QSysInfo::machineUniqueId() returns an empty QByteArray on MacOS

it seems that in the source code file qtbase/src/corelib/global/qglobal.cpp, line 2959, the uuidlen has a length of 36, instead of being 36+1 for the sysctlbyname call

// Darwin: no fixed value, we need to search by name
if (sysctlbyname("kern.uuid", uuid, &uuidlen, nullptr, 0) == 0 && uuidlen == sizeof(uuid))
return QByteArray(uuid, uuidlen - 1);