nfsd4: fix do_probe_callback errors
J. Bruce Fields authored

The errors returned aren't used.  Just return 0 and make them available
to a dprintk().  Also, consistently use -ERRNO errors instead of nfs
errors.
Signed-off-by: default avatarJ. Bruce Fields <bfields@citi.umich.edu>
Reviewed-by: default avatarBenny Halevy <bhalevy@panasas.com>
418cd20a