benchmark: remove unused variables

Remove variables that are assigned but never used.

(This was missed by the linter in previous versions of ESLint but is
flagged by the current version. Updating the linter is contingent on
this change or some similar remedy landing.)

PR-URL: #7600
Reviewed-By: Rod Vagg <rod@vagg.org>
Reviewed-By: Michaël Zasso <mic.besace@gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>

benchmark/dgram/array-vs-concat.js

@@ -41,7 +41,6 @@ var dgram = require('dgram');
 
 function server() {
   var sent = 0;
-  var received = 0;
   var socket = dgram.createSocket('udp4');
 
   var onsend = type === 'concat' ? onsendConcat : onsendMulti;
@@ -71,9 +70,5 @@ function server() {
     }, dur * 1000);
   });
 
-  socket.on('message', function(buf, rinfo) {
-    received++;
-  });
-
   socket.bind(PORT);
 }

benchmark/http/_chunky_http_client.js

@@ -50,8 +50,6 @@ function main(conf) {
     }
   }
 
-  var success = 0;
-  var failure = 0;
   var min = 10;
   var size = 0;
   var mod = 317;
@@ -69,14 +67,12 @@ function main(conf) {
       if ((d.length === pattern.length && d === pattern) ||
           (d.length > pattern.length &&
            d.slice(0, pattern.length) === pattern)) {
-        success += 1;
         did = true;
       } else {
         pattern = 'HTTP/1.1 ';
         if ((d.length === pattern.length && d === pattern) ||
             (d.length > pattern.length &&
              d.slice(0, pattern.length) === pattern)) {
-          failure += 1;
           did = true;
         }
       }

benchmark/static_http_server.js

@@ -6,7 +6,6 @@ var port = 12346;
 var n = 700;
 var bytes = 1024 * 5;
 
-var requests = 0;
 var responses = 0;
 
 var body = 'C'.repeat(bytes);
@@ -37,6 +36,5 @@ server.listen(port, function() {
       });
     });
     req.id = i;
-    requests++;
   }
 });