Merge "Typo fix"

            List<Pair<OnMetadataChangedListener, Executor>> listenerList =

                    mMetadataListeners.get(device);

            if (listenerList == null) {

                // Create new listener/executor list for registeration

                // Create new listener/executor list for registration

                listenerList = new ArrayList<>();

                mMetadataListeners.put(device, listenerList);

            } else {

                // Check whether this device was already registed by the lisenter

                // Check whether this device is already registered by the listener

                if (listenerList.stream().anyMatch((pair) -> (pair.first.equals(listener)))) {

                    throw new IllegalArgumentException("listener was already regestered"

                            + " for the device");