Fix cursor leak in krb5_verify_init_creds

In copy_creds_except, call krb5_cc_end_seq_get so we don't leak the
ccache cursor.

https://github.com/krb5/krb5/commit/62894f854daa8251554376b6b6810fd0e9fecb7f
Author: Greg Hudson <ghudson@mit.edu>
Commit: 62894f854daa8251554376b6b6810fd0e9fecb7f
Branch: master
 src/lib/krb5/krb/vfy_increds.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)