Pull up r25730 from trunk

Pull up r25730 from trunk

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 r25730 | ghudson | 2012-03-05 12:35:14 -0500 (Mon, 05 Mar 2012) | 15 lines

 ticket: 7098
 subject: Fix spurious password expiry warning
 target_version: 1.9.4
 tags: pullup

 r24241 (#6755) introduced a bug where if the KDC sends a LastReq entry
 containing an account expiry time, we send a prompter warning for
 password expiry even if there was no entry containing a password
 expiry time.  Typically, this results in the message "Warning: Your
 password will expire in less than one hour on Thu Jan  1 12:00:00
 1970".

 Fix this by explicitly checking for pw_exp == 0 in warn_pw_expiry()
 after we've gotten past the conditional for invoking the callback.

ticket: 7098
version_fixed: 1.10.1
status: resolved

git-svn-id: svn://anonsvn.mit.edu/krb5/branches/krb5-1-10@25741 dc483132-0cff-0310-8789-dd5450dbe970