Change conditional to match syntax in node.cc:2903

Additionally, fix previous commit's bug of disallowing 1024 and 65535,
which are legal debug ports.

Author: mjseidel

lib/cluster.js

@@ -307,7 +307,7 @@ function masterInit() {
     workerEnv = util._extend(workerEnv, env);
     workerEnv.NODE_UNIQUE_ID = '' + id;
 
-    if (1024 < debugPort < 65535) {
+    if !(debug_port < 1024 || debug_port > 65535) { // If port in range according to node.cc:2903
       for (var i = 0; i < execArgv.length; i++) {
         var match = execArgv[i].match(/^(--debug|--debug-brk)(=\d+)?$/);