clang/scan-build: restore required code

ref: https://github.com/neovim/neovim/pull/11900#discussion_r381860165

src/nvim/marktree.c

@@ -905,6 +905,7 @@ continue_same_node:
           refkey(b, itr->node, itr->i);
           refkey(b, enditr->node, enditr->i);
         } else {
+          past_right = true; // NOLINT
           break;
         }
       }