tiny /etc/passwd parsing optimization

[Václav Zeman]

Hi.
I was looking into how to speed up /etc/passwd parsing. Here is a
trivial patch that improves pwdgrp::parse_passwd() by a tiny bit.
Similar change can be applied to pwdgrp::parse_group() as well. The
resulting assembler shows that it avoids recomputing the pointers into
the array.

2012-02-02  Vaclav Zeman  <vhaisman@gmail.com>

        * passwd.cc (pwdgrp::parse_passwd): Use reference instead of
        #define to access current passwd_buf element.
        * grp.cc (pwdgrp::parse_group): Use reference instead of #define
        to access current group_buf element.

--
VZ
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