hammer_alloc_btree
hammer_node_t hammer_alloc_btree(hammer_transaction_t trans,
parent = hammer_alloc_btree(cursor->trans, 0, &error);
new_node = hammer_alloc_btree(cursor->trans, 0, &error);
parent = hammer_alloc_btree(cursor->trans, 0, &error);
new_leaf = hammer_alloc_btree(cursor->trans, 0, &error);
nnode = hammer_alloc_btree(cursor->trans, 0, &error);
nnode = hammer_alloc_btree(cursor->trans, 0, &error);