FHSS Ack tx done fix

Added missing possible channel switch after ACK tx done process. If
channel switch happen middle of ack send we never switch channel before
this.

Author: Juha Heiskanen

source/MAC/IEEE802_15_4/mac_pd_sap.c

@@ -387,6 +387,10 @@ static int8_t mac_data_interface_tx_done_cb(protocol_interface_rf_mac_setup_s *r
 
     if (rf_ptr->mac_ack_tx_active) {
         rf_ptr->mac_ack_tx_active = false;
+        if (rf_ptr->fhss_api) {
+            //SET tx completed false because ack isnot never queued
+            rf_ptr->fhss_api->data_tx_done(rf_ptr->fhss_api, false, false, 0xff);
+        }
         if (rf_ptr->active_pd_data_request) {
 
             if (rf_ptr->active_pd_data_request->fcf_dsn.securityEnabled) {