NULL pointer dereference in tai64nlocal

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Hi,

Had a bit of an explosion today with what I believe to be a corrupt timesta=
mp
in a logfile.

Ended up tracking it down to this:

# echo @ | tai64nlocal=20
Segmentation fault
# dmesg | tail -1
# [27512262.312802] tai64nlocal[9534]: segfault at 14 ip 00000000004007b4 s=
p 00007fff2cd2f230 error 4 in tai64nlocal[400000+2000]

Which, on my system appears to correspond to tai64nlocal.c:

55       t =3D localtime(&secs);
56       out(num,fmt_ulong(num,1900 + t->tm_year));

Which, appears to be due to localtime() being called with an unrepresentable
time, thus returning NULL.

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