golang: change log output location (#625)

Co-authored-by: guyinyou <guyinyou.gyy@alibaba-inc.com>
diff --git a/golang/rpc_client.go b/golang/rpc_client.go
index a499a76..ecb29a1 100644
--- a/golang/rpc_client.go
+++ b/golang/rpc_client.go
@@ -100,8 +100,8 @@
 
 func (rc *rpcClient) GracefulStop() error {
 	rc.mux.Lock()
-	sugarBaseLogger.Warnf("close rpc client, target=%s", rc.target)
 	closeResult := rc.conn.Close()
+	sugarBaseLogger.Warnf("close rpc client, target=%s", rc.target)
 	rc.mux.Unlock()
 	return closeResult
 }