dedupe: record dedupe errors in golden output

dedupe: record dedupe errors in golden output

The xfs_io dedupe command originally didn't print dedupe errors
to stderr like you'd expect.  Since that was fixed, the golden
output should be changed to reflect that.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>