zfs(v13)+nfs and open(..., O_WRONLY|O_CREAT|O_EXCL, ...) returns io error

[Daniel Braniss]

this was fixed back in June, but now, it cropped up under 8BETA/32 bits,
the 64 bit is ok.
see
	http://www.freebsd.org/cgi/query-pr.cgi?pr=135412
thanks,
	danny