Removed unused field

src/main/java/com/owncloud/android/ui/activity/FileDisplayActivity.java

@@ -678,7 +678,7 @@ public class FileDisplayActivity extends HookActivity
         inflater.inflate(R.menu.main_menu, menu);
         menu.findItem(R.id.action_create_dir).setVisible(false);
 
-        MenuItem selectAll = menu.findItem(R.id.action_select_all).setVisible(false);
+        menu.findItem(R.id.action_select_all).setVisible(false);
         final MenuItem item = menu.findItem(R.id.action_search);
         searchView = (SearchView) MenuItemCompat.getActionView(item);