Declare variable

Author: IonicaBizau

lib/index.js

@@ -529,7 +529,7 @@ GitStats.prototype.authors = function (options, callback) {
     repo.exec("shortlog -s -n --all", function (err, stdout) {
         if (err) { return callback(err); }
         var lines = stdout.split("\n");
-        pieData = stdout.split("\n").map(function (c) {
+        var pieData = stdout.split("\n").map(function (c) {
             var splits = c.split("\t").map(function (cc) {
                 return cc.trim();
             });