pull up r18961 from trunk

pull up r18961 from trunk

 r18961@cathode-dark-space:  epeisach | 2006-12-18 06:26:59 -0500
 ticket: new
 subject: krb5_rc_io_open_internal on error will call close(-1)

 If there is an error in opening the replay cache - memory is freed, but
 close() is invoked with -1 (failure from open()).  While technically,
 close() will return EBADF in such a case, and nothing bad will happen,
 valgrind picks up on this and provides an error...

ticket: 5115
version_fixed: 1.6

git-svn-id: svn://anonsvn.mit.edu/krb5/branches/krb5-1-6@18966 dc483132-0cff-0310-8789-dd5450dbe970