Remove call-trough.

prrt/proto/processes/dataTransmitter.c

@@ -86,7 +86,7 @@ static bool send_packet(PrrtSocket *sock_ptr, PrrtPacket *packet) {
         do {
             prrtTimeDifference_t now = (prrtTimeDifference_t) PrrtClock_get_current_time_us();
             diff = ((prrtTimeDifference_t) sock_ptr->nextSendTime) - now;
-            int64_t cwnd = (int64_t) BBR_getCwnd(sock_ptr->receiver->bbr);
+            int64_t cwnd = (int64_t) PrrtReceiver_getBBRCwnd(sock_ptr->receiver);
             int64_t pipe = (int64_t) PrrtReceiver_get_pipe(sock_ptr->receiver);
             space = cwnd - pipe;
             debug(DEBUG_DATATRANSMITTER, "C: %u, P: %u, S: %d", cwnd, pipe, space);