message: Fix begin_ctx / end_ctx duration ftrace times
diff: @@ -426,7 +426,7 @@ void TraceEvents::new_event_ftrace_print( trace_event_t &event )
  ( add_event->duration >= 1 * NSECS_PER_MSEC ) )
  {
  size_t len = strlen( newbuf );
  - double val = event.duration * ( 1.0 / NSECS_PER_MSEC );
  + double val = add_event->duration * ( 1.0 / NSECS_PER_MSEC );
  snprintf( newbuf + len, sizeof( newbuf ) - len, " [%.*lf ms]", 2, val );
  newbuf[ sizeof( newbuf ) - 1 ] = 0;
  