__bt_new
if ((h = __bt_new(t, &npg)) == NULL)
if ((r = __bt_new(t, &npg)) == NULL)
if ((l = __bt_new(t, &lnpg)) == NULL ||
(r = __bt_new(t, &rnpg)) == NULL)
PAGE *__bt_new __P((BTREE *, db_pgno_t *));