fix: store notification events immediately for persistent queues (#17112)

internal/event/target/mqtt.go

@@ -1,4 +1,4 @@
-// Copyright (c) 2015-2021 MinIO, Inc.
+// Copyright (c) 2015-2023 MinIO, Inc.
 //
 // This file is part of MinIO Object Storage stack
 //
@@ -200,13 +200,12 @@ func (target *MQTTTarget) Send(eventKey string) error {
 // Save - saves the events to the store if queuestore is configured, which will
 // be replayed when the mqtt connection is active.
 func (target *MQTTTarget) Save(eventData event.Event) error {
-	if err := target.init(); err != nil {
-		return err
-	}
-
 	if target.store != nil {
 		return target.store.Put(eventData)
 	}
+	if err := target.init(); err != nil {
+		return err
+	}
 
 	// Do not send if the connection is not active.
 	_, err := target.isActive()