fix valgrind/s Conditional jump or move depends on uninitialised value(s)
fix valgrind/s Conditional jump or move depends on uninitialised value(s)

=00:00:00:16.762 149400== Conditional jump or move depends on uninitialised value(s)
==00:00:00:16.762 149400==    at 0x2C002FA: cctz::TimeZoneInfo::BreakTime(std::chrono::time_point<std::chrono::_V2::system_clock, std::chrono::duration<long, std::ratio<1l, 1l> > > const&) const (time_zone_info.cc:644)
==00:00:00:16.762 149400==    by 0x2BFBEC4: BreakTime (time_zone_impl.h:45)
==00:00:00:16.762 149400==    by 0x2BFBEC4: cctz::time_zone::lookup(std::chrono::time_point<std::chrono::_V2::system_clock, std::chrono::duration<long, std::ratio<1l, 1l> > > const&) const (time_zone_lookup.cc:29)
==00:00:00:16.762 149400==    by 0x2BF28DA: lookup<std::chrono::duration<long int, std::ratio<1l, 1000000000l> > > (time_zone.h:83)
Jellybooks/cctz,google/cctz,Jellybooks/cctz,Jellybooks/cctz,google/cctz