Reduce one iteration of pending flows in the discovery flow helper (#110918)

homeassistant/helpers/discovery_flow.py

@@ -86,17 +86,20 @@ class FlowDispatcher:
         pending_flows = self.pending_flows
         self.pending_flows = {}
         self.started = True
-        init_coros = [
-            _async_init_flow(
-                self.hass, flow_key.domain, flow_values.context, flow_values.data
-            )
+        init_coros = (
+            init_coro
             for flow_key, flows in pending_flows.items()
             for flow_values in flows
-        ]
-        await gather_with_limited_concurrency(
-            FLOW_INIT_LIMIT,
-            *[init_coro for init_coro in init_coros if init_coro is not None],
+            if (
+                init_coro := _async_init_flow(
+                    self.hass,
+                    flow_key.domain,
+                    flow_values.context,
+                    flow_values.data,
+                )
+            )
         )
+        await gather_with_limited_concurrency(FLOW_INIT_LIMIT, *init_coros)
 
     @callback
     def async_create(self, domain: str, context: dict[str, Any], data: Any) -> None: