fix compiler warning

  (declare (optimize (debug 3)))

  (multiple-value-bind (byte-vector expected-values)

      (generate-random-test bitsize signedp big-endian-p)

    (declare (ignore byte-vector))

    (let ((tmpfile (make-pathname :name "tmp" :defaults *output-directory*))

	  (values-seq (coerce expected-values seq-type)))

      (ensure-directories-exist tmpfile)