Update client/message.go

Co-Authored-By: Luca Moser <moser.luca@gmail.com>

client/message.go

@@ -13,13 +13,12 @@ const (
 func (api *GoShimmerAPI) FindMessageById(base58EncodedIds []string) (*webapi_message.Response, error) {
 	res := &webapi_message.Response{}
 
-	err := api.do(
+	if err := api.do(
 		http.MethodPost,
 		routeFindById,
 		&webapi_message.Request{Ids: base58EncodedIds},
 		res,
-	)
-	if err != nil {
+	); err != nil {
 		return nil, err
 	}