* net.cc (free_addr_list): Add define for symmetry.

    * net.cc (free_addr_list): Add define for symmetry.
        (free_hostent_ptr): Use free_addr_list to free h_addr_list element.
        (dup_addr_list): New static function.
        (dup_hostent_ptr): Use dup_addr_list instead of dup_char_list in order
        to handle embedded null characters.