tools: move message listener to worker objects

Moving the `message` event listener from the cluster object to each
worker object allows easier backporting of the recent jslint
changes since v5.x and older do not have v6.x's `worker` parameter
in the cluster object's `message` event.
PR-URL: #6212
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>

Author: mscdex

tools/jslint.js

@@ -125,20 +125,6 @@ if (cluster.isMaster) {
 sendWork(worker);
 });
 
-cluster.on('message',function(worker,results){
-if(typeofresults!=='number'){
-// The worker sent us results that are not all successes
-if(!workerConfig.sendAll)
-failures+=results.length;
-outFn(formatter(results)+'\r\n');
-printProgress();
-}else{
-successes+=results;
-}
-// Try to give the worker more work to do
-sendWork(worker);
-});
-
 process.on('exit',function(){
 if(showProgress){
 curPath='Done';
@@ -149,7 +135,21 @@ if (cluster.isMaster) {
 });
 
 for(i=0;i<numCPUs;++i)
-cluster.fork();
+cluster.fork().on('message',onWorkerMessage);
+
+functiononWorkerMessage(results){
+if(typeofresults!=='number'){
+// The worker sent us results that are not all successes
+if(!workerConfig.sendAll)
+failures+=results.length;
+outFn(formatter(results)+'\r\n');
+printProgress();
+}else{
+successes+=results;
+}
+// Try to give the worker more work to do
+sendWork(this);
+}
 
 functionsendWork(worker){
 if(!files||!files.length){