fixed timers, whoops.

Fixes issue https://github.com/ry/node/issues/issue/481

lib/timers.js

@@ -43,7 +43,6 @@ function shift (list) {
 function remove (item) {
   item._idleNext._idlePrev = item._idlePrev;
   item._idlePrev._idleNext = item._idleNext;
-  item._idleNext = null;
 }
 
 
@@ -209,7 +208,7 @@ exports.setTimeout = function (callback, after) {
 
 
 exports.clearTimeout = function (timer) {
-  if (timer) {
+  if (timer && (timer.callback || timer._onTimeout)) {
     timer.callback = timer._onTimeout = null;
     exports.unenroll(timer);
     if (timer instanceof Timer) timer.stop(); // for after === 0

test/simple/test-net-can-reset-timeout.js

@@ -0,0 +1,41 @@
+var net = require('net');
+var common = require('../common');
+var assert = require('assert');
+
+var timeoutCount = 0;
+
+var server = net.createServer(function(stream){
+  stream.setTimeout(100);
+
+  stream.on('timeout', function () {
+    console.log("timeout");
+    // try to reset the timeout.
+    stream.write("WHAT.");
+    // don't worry, the socket didn't *really* time out, we're just thinking
+    // it did.
+    timeoutCount += 1;
+  });
+
+  stream.on('end', function () {
+    console.log("server side end");
+    stream.end();
+  });
+});
+
+server.listen(common.PORT, function() {
+  var c = net.createConnection(common.PORT);
+
+  c.on('data', function () {
+    c.end();
+  });
+
+  c.on('end', function () {
+    console.log("client side end");
+    server.close();
+  });
+});
+
+
+process.on('exit', function () {
+  assert.equal(1, timeoutCount);
+});