state-routes.lua: Use the returned iterator from enum_params() to update routes info

This does not really fix anything but it saves some CPU cycles as we don't need
to get the route params from the cache anymore.

src/scripts/device/state-routes.lua

@@ -159,28 +159,23 @@ store_or_restore_routes_hook = AsyncEventHook {
   },
   steps = {
     start = {
-      next = "evaluate",
+      next = "none",
       execute = function (event, transition)
+        local source = event:get_source ()
+        local device = event:get_subject ()
+
         -- Make sure the routes are always updated before evaluating them.
         -- https://gitlab.freedesktop.org/pipewire/wireplumber/-/issues/762
-        local device = event:get_subject ()
+        device:enum_params ("EnumRoute", function (enum_route_it, e)
-        device:enum_params ("EnumRoute", function (_, e)
+          local selected_routes = {}
+          local push_select_routes = false
+
+          -- check for error
           if e then
             transition:return_error ("failed to enum routes: "
                 .. tostring (e));
-          else
+            return
-            transition:advance ()
           end
-        end)
-      end
-    },
-    evaluate = {
-      next = "none",
-      execute = function (event, transition)
-        local device = event:get_subject ()
-        local source = event:get_source ()
-        local selected_routes = {}
-        local push_select_routes = false
 
           -- Make sure the device is still valid
           if (device:get_active_features() & Feature.Proxy.BOUND) == 0 then
@@ -197,7 +192,7 @@ store_or_restore_routes_hook = AsyncEventHook {
           local new_route_infos = {}
 
           -- look at all the routes and update/reset cached information
-        for p in device:iterate_params ("EnumRoute") do
+          for p in enum_route_it:iterate() do
             -- parse pod
             local route = cutils.parseParam (p, "EnumRoute")
             if not route then
@@ -282,6 +277,7 @@ store_or_restore_routes_hook = AsyncEventHook {
           end
 
           transition:advance ()
+        end)
       end
     }
   }