perf: remove duplicate codes

This line of code has been implemented in the prepareError function

Author: xiaoxiaojx

lib/_http_server.js

@@ -689,7 +689,6 @@ function onParserExecuteCommon(server, socket, parser, state, ret, d) {
 
   if (ret instanceof Error) {
     prepareError(ret, parser, d);
-    ret.rawPacket = d || parser.getCurrentBuffer();
     debug('parse error', ret);
     socketOnError.call(socket, ret);
   } else if (parser.incoming && parser.incoming.upgrade) {