Fix bug in previous commit that passed the wrong default value to login_getcapstr(3).  Also fix a longer-standing bug (login_close(3) frees the string returned by login_getcapstr(3)) by reorganizing the code a little, and use login_getpwclass(3) instead of login_getclass(3) if we already have a struct pwd.
Fix bug in previous commit that passed the wrong default value to
login_getcapstr(3).  Also fix a longer-standing bug (login_close(3)
frees the string returned by login_getcapstr(3)) by reorganizing the
code a little, and use login_getpwclass(3) instead of login_getclass(3)
if we already have a struct pwd.

Sponsored by:	DARPA, NAI Labs

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