TDB on OpenBSD problem.

[tridge at samba.org]

> The code that causes a tdb to grow is in tdb_expand() in tdb/tdb.c.
> Can you instrument this code with DEBUG level zeros to try and track
> down what is causing the gig expansion. That level of expansion would
> point to a bug in the interaction between tdb and mmap or fcntl.

another thing to try is to disable mmap in tdb.c and see if that fixes
it. If not then we should suspect a tdb logic bug - the non-mmap code
is pretty portable.