Removed callback to write, as it is not needed.

lib/appenders/file.js

@@ -62,12 +62,7 @@ function fileAppender (file, layout, logSize, numBackups) {
   openFiles.push(logFile);
   
   return function(loggingEvent) {
-    logFile.write(layout(loggingEvent) + eol, "utf8", 
+    logFile.write(layout(loggingEvent) + eol, "utf8");
-                  function() { 
-                    // just here to keep the event loop
-                    // open  - doesn't work.
-                    return; 
-                  });
   };
 }