fix client do method done not use when err not nil (#1948)

transport/http/client.go

@@ -289,13 +289,12 @@ func (client *Client) do(req *http.Request) (*http.Response, error) {
 	if err == nil {
 		err = client.opts.errorDecoder(req.Context(), resp)
 	}
-
-	if err != nil {
-		return nil, err
-	}
 	if done != nil {
 		done(req.Context(), selector.DoneInfo{Err: err})
 	}
+	if err != nil {
+		return nil, err
+	}
 	return resp, nil
 }