Fix UL throughput counter in periodic PNF logs

Function pointer send_p7_msg() returns a bool, so correctly set the
type, and interpret it correspondingly.

nfapi/open-nFAPI/pnf/src/pnf_p7_interface.c

@@ -268,8 +268,8 @@ int nfapi_pnf_p7_nr_rx_data_ind(nfapi_pnf_p7_config_t* config, nfapi_nr_rx_data_
 
 	pnf_p7_t* _this = (pnf_p7_t*)(config);
   AssertFatal(_this->_public.send_p7_msg, "Function pointer must be configured|");
-	int ret = _this->_public.send_p7_msg(_this, (nfapi_nr_p7_message_header_t*)ind, sizeof(nfapi_nr_rx_data_indication_t));
-  if (ret == 0) {
+	bool ret = _this->_public.send_p7_msg(_this, (nfapi_nr_p7_message_header_t*)ind, sizeof(nfapi_nr_rx_data_indication_t));
+  if (ret) {
     for (int i = 0; i < ind->number_of_pdus; ++i)
       _this->nr_stats.ul.bytes += ind->pdu_list[i].pdu_length;
   }