dbAdjTree
dbAdjTree(tp, leafno ^ budsz, cursz, is_ctl);
dbAdjTree(tp, leafno, newval, is_ctl);
dbAdjTree(tp, buddy, NOFREE, is_ctl);
dbAdjTree(tp, leafno, NOFREE, is_ctl);
dbAdjTree(tp, leafno, newval, is_ctl);
static void dbAdjTree(dmtree_t *tp, int leafno, int newval, bool is_ctl);