pull up r18895 from trunk

pull up r18895 from trunk

 r18895@cathode-dark-space:  coffman | 2006-12-01 14:18:26 -0500
 subject: Return edata from non-"PA_REQUIRED" preauth types
 ticket: new
 Target_Version: 1.6
 tags: pullup
 Component: krb5-kdc

     * src/kdc/kdc_preauth.c (check_padata)
     Return e-data from any failing preauth module.
     Save the e-data and return value from the first failing module.
     If a subsequent module marked as PA_REQUIRED fails, return
     its e-data and error instead.

     * src/kdc/kdc_preauth.c (load_preauth_plugins)
     Quiet compiler warning by setting pointer to NULL.

ticket: 4972
version_fixed: 1.6

git-svn-id: svn://anonsvn.mit.edu/krb5/branches/krb5-1-6@18902 dc483132-0cff-0310-8789-dd5450dbe970