format code

dubbo-remoting/dubbo-remoting-api/src/main/java/org/apache/dubbo/remoting/api/connection/AbstractConnectionClient.java

@@ -65,10 +65,7 @@ public final boolean retain() {
         long oldCount = COUNTER_UPDATER.getAndIncrement(this);
         if (oldCount <= 0) {
             COUNTER_UPDATER.getAndDecrement(this);
-            logger.warn(
-                    PROTOCOL_ERROR_CLOSE_CLIENT,
-                    "",
-                    "",
+            logger.info(
                     "Retain failed, because connection " + remote
                             + " has been destroyed but not yet removed, will create a new one instead."
                             + " Check logs below to confirm that this connection finally gets removed to make sure there's no potential memory leak!");