typo

src/updater.js

@@ -162,6 +162,8 @@ function checkFreeDiskSpace(neededSpace, callback) {
     // can probably be a bit more aggressive here since a new update can bring in new docker images
     df.file('/').then(function (diskUsage) {
         if (diskUsage.available < neededSpace) return callback(new UpdaterError(UpdaterError.NO_SPACE, 'Not enough disk space'));
+
+        callback(null);
     }).catch(function (error) {
         callback(new UpdaterError(UpdaterError.INTERNAL_ERROR, error));
     });