added syncStatusCallback variable declaration

Author: madsleejensen

CodePush.js

@@ -428,6 +428,8 @@ function codePushify(options = {}) {
           CodePush.notifyAppReady();
         } else {
           let rootComponentInstance = this.refs.rootComponent;
+
+          let syncStatusCallback;
           if (rootComponentInstance && rootComponentInstance.codePushStatusDidChange) {
             syncStatusCallback = rootComponentInstance.codePushStatusDidChange.bind(rootComponentInstance);
           }
@@ -436,7 +438,7 @@ function codePushify(options = {}) {
           if (rootComponentInstance && rootComponentInstance.codePushDownloadDidProgress) {
             downloadProgressCallback = rootComponentInstance.codePushDownloadDidProgress.bind(rootComponentInstance);
           }
-          
+
           CodePush.sync(options, syncStatusCallback, downloadProgressCallback);
           if (options.checkFrequency === CodePush.CheckFrequency.ON_APP_RESUME) {
             ReactNative.AppState.addEventListener("change", (newState) => {