Enable round-trip verifier in verbose mode

src/network/transportsender.cc

@@ -152,15 +152,14 @@ void TransportSender<MyState>::tick( void )
 
   attempt_prospective_resend_optimization( diff );
 
+  if ( verbose ) {
     /* verify diff has round-trip identity (modulo Unicode fallback rendering) */
-  /*
     MyState newstate( assumed_receiver_state->state );
     newstate.apply_string( diff );
     if ( current_state.compare( newstate ) ) {
       fprintf( stderr, "Diff: %s\n", diff.c_str() );
     }
-  */
-
+  }
 
   if ( diff.empty() && (now >= next_ack_time) ) {
     send_empty_ack();