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.

(cherry picked from commit 62894f854daa8251554376b6b6810fd0e9fecb7f)

https://github.com/krb5/krb5/commit/db81478f8c2afd247b4c401602dc3b6bd8f40f4e
Author: Greg Hudson <ghudson@mit.edu>
Committer: Tom Yu <tlyu@mit.edu>
Commit: db81478f8c2afd247b4c401602dc3b6bd8f40f4e
Branch: krb5-1.13
 src/lib/krb5/krb/vfy_increds.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)