Update readablestream.js

Co-authored-by: James M Snell <jasnell@gmail.com>

Author: anonrig

lib/internal/webstreams/readablestream.js

@@ -314,8 +314,9 @@ class ReadableStream {
     // keep the previous no-op behavior.
     const controller = this[kState].controller;
     if (controller === undefined) {
-      if (this[kState].state === 'readable')
+      if (this[kState].state === 'readable') {
         readableStreamError(this, error);
+      }
       return;
     }
     if (isReadableStreamDefaultController(controller))