tdb memory consumption

[tridge at samba.org]

Volker,

Just spoke to Volker, and I got it totally wrong :-)

The bit I missed is this:

	if (tdb->num_lockrecs > 1) {
		*lck = tdb->lockrecs[tdb->num_lockrecs-1];
	}
	tdb->num_lockrecs -= 1;

that effectively shrinks the array when the count on an element drops
to zero. So the memory usage will in the worst case be the maximum
number of hash chains actually locked times 12.

Sorry for the false alarm!

Cheers, Tridge