hammer_delete_node
void hammer_delete_node(hammer_transaction_t trans,
hammer_delete_node(cursor->trans, parent);
hammer_delete_node(cursor->trans, parent);
hammer_delete_node(cursor->trans, node);
hammer_delete_node(cursor->trans, node);
hammer_delete_node(cursor->trans, parent->node);
hammer_delete_node(cursor->trans, onode);
hammer_delete_node(cursor->trans, onode);