Don't register the connection callbacks for now, since they're unused

src/main.c

@@ -72,7 +72,7 @@ static void stream(STREAM_CONFIGURATION* config, const char* address, const char
   }
 
   struct sockaddr_in *addr = (struct sockaddr_in*)res->ai_addr;
-  LiStartConnection(addr->sin_addr.s_addr, config, &connection_callbacks, decoder_callbacks,
+  LiStartConnection(addr->sin_addr.s_addr, config, NULL, decoder_callbacks,
     &audio_callbacks, NULL, NULL, 0, client_get_server_version());
   freeaddrinfo(res);