Reduce TX packet counter in case interface is not active

Author: troelsjessen

src/csp_if_cblk.c

@@ -45,6 +45,8 @@ int csp_if_cblk_tx(csp_iface_t * iface, uint16_t via, csp_packet_t *packet, int
 
     if (ifdata->cblk_tx_is_active != NULL && !ifdata->cblk_tx_is_active(iface)) {
 
+        iface->tx--;
+        iface->txbytes -= packet->length;
         if (from_me) {
             forward_other_ifcs(iface, packet);
         } else {