Bugfix/cppcheck error code fixes (#244)

* Add flawfinder. Add error code for exit status.

* fix errors found by cppcheck

* fix initialization warning in unit test compile

Co-authored-by: Steve Karg <skarg@users.sourceforge.net>

src/bacnet/basic/service/h_arf.c

@@ -173,7 +173,7 @@ void handler_atomic_read_file(uint8_t *service_request,
 #if PRINT_ENABLED
                 fprintf(stderr, "ARF: fileStartRecord %d, %u RecordCount.\n",
                     (int)data.type.record.fileStartRecord,
-                    (int)data.type.record.RecordCount);
+                    (unsigned)data.type.record.RecordCount);
 #endif
                 len = arf_ack_encode_apdu(&Handler_Transmit_Buffer[pdu_len],
                     service_data->invoke_id, &data);