[fix] Ensure all remaining data is read as a single chunk

Do not rely on undocumented behavior, call `socket.read()` with the actual
number of bytes to read.

Refs: nodejs/node#60441

Author: lpinca

lib/websocket.js

@@ -1308,23 +1308,23 @@ function socketOnClose() {
 
   websocket._readyState = WebSocket.CLOSING;
 
-  let chunk;
-
   //
   // The close frame might not have been received or the `'end'` event emitted,
   // for example, if the socket was destroyed due to an error. Ensure that the
   // `receiver` stream is closed after writing any remaining buffered data to
   // it. If the readable side of the socket is in flowing mode then there is no
-  // buffered data as everything has been already written and `readable.read()`
-  // will return `null`. If instead, the socket is paused, any possible buffered
-  // data will be read as a single chunk.
+  // buffered data as everything has been already written. If instead, the
+  // socket is paused, any possible buffered data will be read as a single
+  // chunk.
   //
   if (
     !this._readableState.endEmitted &&
     !websocket._closeFrameReceived &&
     !websocket._receiver._writableState.errorEmitted &&
-    (chunk = websocket._socket.read()) !== null
+    this._readableState.length !== 0
   ) {
+    const chunk = this.read(this._readableState.length);
+
     websocket._receiver.write(chunk);
   }