Fix a KDC memory leak that was introduced by r23724 that could leak
the decoded request.

https://github.com/krb5/krb5/commit/d20d802b8e44178017fd1a1da55a72194f50da55
Commit By: tlyu
Revision: 23959
Changed Files:
U   trunk/src/kdc/do_tgs_req.c