Fix multiple UPN handling in PKINIT client certs

Commit 0f26c1c7504777d6e7bfa1d3dee575c504ab6c05 neglected to increment
the array index when storing UPN strings.  Also remove the unused
num_found variable.

[ghudson@mit.edu: pulled from a larger commit; added removal of
num_found; wrote commit message]

https://github.com/krb5/krb5/commit/4e325cadee4f5511e494f0b4fd9faeb24e7b7c08
Author: Ken Hornstein <kenh@cmf.nrl.navy.mil>
Committer: Greg Hudson <ghudson@mit.edu>
Commit: 4e325cadee4f5511e494f0b4fd9faeb24e7b7c08
Branch: master
 src/plugins/preauth/pkinit/pkinit_crypto_openssl.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)