http: remove unused parameter in _read of ImcomingMessage

Author: Ayase-252

lib/_http_incoming.js

@@ -152,7 +152,7 @@ IncomingMessage.prototype.setTimeout = function setTimeout(msecs, callback) {
 };
 
 
-IncomingMessage.prototype._read = function _read(n) {
+IncomingMessage.prototype._read = function _read() {
   if (!this._consuming) {
     this._readableState.readingMore = false;
     this._consuming = true;