Fix rare leak in krb5_cccol_have_content()

If krb5_cc_start_seq_get() fails inside the loop, close the current
credential cache before continuing to the next one.  Reported by Todd
Lipcon.

https://github.com/krb5/krb5/commit/1735f2e74767e56ac3bd75de61d41b8363ec6ce4
Author: Greg Hudson <ghudson@mit.edu>
Commit: 1735f2e74767e56ac3bd75de61d41b8363ec6ce4
Branch: master
 src/lib/krb5/ccache/cccursor.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)