another bug fix

pocketfft.cc

@@ -2507,7 +2507,7 @@ template<typename T> py::array hartley_internal(const py::array &in,
   py::array res = inplace ? in : py::array_t<T>(dims);
   auto s_i(copy_strides(in)), s_o(copy_strides(res));
   pocketfft_general_hartley<T>(dims, s_i, s_o, axes, (const T *)in.data(),
-    (T *)res.mutable_data(), 1.);
+    (T *)res.mutable_data(), fct);
   return res;
   }
 py::array hartley(const py::array &in, py::object axes_, double fct,