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If the keytab file isn't readable, we may call krb5_kt_end_seq_get() with an invalid kt_cursor. BUG: https://bugzilla.samba.org/show_bug.cgi?id=10490 Pair-Programmed-With: Stefan Metzmacher <metze@samba.org> Signed-off-by: Michael Saxl <mike@mwsys.mine.bz> Signed-off-by: Stefan Metzmacher <metze@samba.org> Reviewed-by: Andreas Schneider <asn@samba.org>