moved drain callback to the socket so it doesn't get recreated on eac…

…h request.

lib/middleware/timeout.js

@@ -39,11 +39,11 @@ module.exports = function timeout(options) {
       }
     }
 
-    if (!req.clearTimeout) {
-      req.clearTimeout = function() {
+    if (!req.socket.clearTimeout) {
+      req.socket.clearTimeout = function() {
         req.socket.setTimeout(0);
       };
-      req.socket.once('drain', req.clearTimeout); // Clear whenever we send anything
+      req.socket.once('drain', req.socket.clearTimeout); // Clear whenever we send anything
     }
 
     return next();