There's no need to wrap this function inside a function afaict

js/helpers.js

@@ -756,8 +756,7 @@ window.textsecure.subscribeToPush = function(message_callback) {
 	};
 };
 
-window.textsecure.registerSingleDevice = function() {
-	return function(number, verificationCode, stepDone) {
+window.textsecure.registerSingleDevice = function(number, verificationCode, stepDone) {
     var signalingKey = textsecure.crypto.getRandomBytes(32 + 20);
     textsecure.storage.putEncrypted('signaling_key', signalingKey);
 
@@ -783,7 +782,6 @@ window.textsecure.registerSingleDevice = function() {
         });
     });
 }
-}();
 
 window.textsecure.registerSecondDevice = function(encodedDeviceInit, cryptoInfo, stepDone) {
 	var deviceInit = textsecure.protos.decodeDeviceInit(encodedDeviceInit);