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tree: fix typos in message address calculation

Since Blksz - Pivhdsz is even, Pivspc and Bufspc are equal, but
logically these two uses were backwards.

--- a/tree.c

+++ b/tree.c

@@ -167,10 +167,10 @@

 	b->bufsz += msgsz(m)-2;

 	p = b->data + Pivspc + 2*b->nbuf;

-	o = Pivspc - b->bufsz;

+	o = Bufspc - b->bufsz;

 	PBIT16(p, o);

-	p = b->data + Bufspc + o;

+	p = b->data + Pivspc + o;

 	*p = m->op;		p += 1;

 	PBIT16(p, m->nk);	p += 2;

 	memcpy(p, m->k, m->nk);	p += m->nk;