pull up r24705 from trunk

 ------------------------------------------------------------------------
 r24705 | tlyu | 2011-03-15 17:47:19 -0400 (Tue, 15 Mar 2011) | 8 lines

 ticket: 6881
 subject: KDC double-free when PKINIT enabled [MITKRB5-SA-2011-003 CVE-2011-0284]
 tags: pullup
 target_version: 1.9.1

 Fix a double-free condition in the KDC that can occur during an
 AS-REQ when PKINIT is enabled.

https://github.com/krb5/krb5/commit/f15517b1846c4663d9b6258ef213550a8b8e471a
Commit By: tlyu
Revision: 24708
Changed Files:
U   branches/krb5-1-7/src/kdc/do_as_req.c