Restrict MediaRouter selection

Actually restrict the programmatic selection of routes by
type. (Oops.)

Change-Id: I91e837f7ecbcddb626c664fb470e8296d563498d

media/java/android/media/MediaRouter.java

@@ -276,6 +276,7 @@ public class MediaRouter {
             Log.w(TAG, "selectRoute ignored; cannot select route with supported types " +
                     typesToString(route.getSupportedTypes()) + " into route types " +
                     typesToString(types));
+            return;
         }
 
         if (sStatic.mSelectedRoute != null) {