Update lib/internal/http2/core.js

Author: ronag

lib/internal/http2/core.js

@@ -2174,7 +2174,7 @@ class Http2Stream extends Duplex {
     process.nextTick(() => {
       if (writeCallbackErr ||
         !this._writableState.ending ||
-        this._writableState.buffered?.length ||
+        this._writableState.buffered.length ||
         (this[kState].flags & STREAM_FLAGS_HAS_TRAILERS))
         return endCheckCallback();
       debugStreamObj(this, 'shutting down writable on last write');