minor tweak to data function check.

Author: ctalkington

lib/core.js

@@ -429,9 +429,7 @@ Archiver.prototype.directory = function(dirpath, destpath, data) {
   if (typeof data === 'function') {
     dataFunction = data;
     data = {};
-  } else if (typeof data === 'object') {
-    data = data;
-  } else {
+  } else if (typeof data !== 'object') {
     data = {};
   }