mpd: make GetRecursiveDirectory return SongIterator

src/search_engine.cpp

@@ -447,17 +447,20 @@ void SearchEngine::Search()
 	MPD::SongList list;
 	if (Config.search_in_db)
 	{
-		MPD::ItemIterator item = Mpd.GetDirectoryRecursive("/"), end;
-		for (; item != end; ++item)
-			if (item->type() != MPD::Item::Type::Song)
-				list.push_back(std::move(item->song()));
+		std::copy(
+			std::make_move_iterator(Mpd.GetDirectoryRecursive("/")),
+			std::make_move_iterator(MPD::SongIterator()),
+			std::back_inserter(list)
+		);
 	}
 	else
+	{
 		std::copy(
 			myPlaylist->main().beginV(),
 			myPlaylist->main().endV(),
 			std::back_inserter(list)
 		);
+	}
 	
 	bool any_found = 1;
 	bool found = 1;