Fix iprop server stub error management

The ipropd stubs free client_name and server_name in the cleanup
handler, so should not free them in out-of-memory conditions.
Reported by Will Fiveash.

(cherry picked from commit d998b088adb875bc0a4e13c184075f91fb23336b)

https://github.com/krb5/krb5/commit/f513d6705809f30ae907059b5a367ac2718a96f6
Author: Greg Hudson <ghudson@mit.edu>
Committer: Tom Yu <tlyu@mit.edu>
Commit: f513d6705809f30ae907059b5a367ac2718a96f6
Branch: krb5-1.13
 src/kadmin/server/ipropd_svc.c |    4 ----
 1 files changed, 0 insertions(+), 4 deletions(-)