Codechange: use std::shared_ptr to manage saveload filters instead of manually trying to avoid double frees

src/network/network_server.h

@@ -69,7 +69,7 @@ public:
 	CommandQueue outgoing_queue; ///< The command-queue awaiting delivery
 	size_t receive_limit;        ///< Amount of bytes that we can receive at this moment
 
-	struct PacketWriter *savegame; ///< Writer used to write the savegame.
+	std::shared_ptr<struct PacketWriter> savegame; ///< Writer used to write the savegame.
 	NetworkAddress client_address; ///< IP-address of the client (so they can be banned)
 
 	ServerNetworkGameSocketHandler(SOCKET s);