hammer_ip_next
int hammer_ip_next(hammer_cursor_t cursor);
error = hammer_ip_next(cursor);
error = hammer_ip_next(cursor);
error = hammer_ip_next(cursor);
error = hammer_ip_next(&cursor);
error = hammer_ip_next(&cursor);
error = hammer_ip_next(&cursor);
error = hammer_ip_next(&cursor);
error = hammer_ip_next(&cursor);
error = hammer_ip_next(&cursor);