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/2515f9ae54e28cbfa4ad42b94ced6b4bd43b054c
Author: Greg Hudson <ghudson@mit.edu>
Committer: Tom Yu <tlyu@mit.edu>
Commit: 2515f9ae54e28cbfa4ad42b94ced6b4bd43b054c
Branch: krb5-1.14
 src/kadmin/server/ipropd_svc.c |    4 ----
 1 files changed, 0 insertions(+), 4 deletions(-)