Fixed the "missed" count in timerfd example

[pauldeng]

Hi Chris,

Thanks for the blog topic about timerfd. It helps me a lot!

I notice you already provided a fix in your blog post regarding the "missed" count in timerfd example. It seems the example in the GitHub is not updated accordingly.

In fact, I am still not quite understand your comments in your blog hope that you can help: "when you read, the value is a count of the timer events since the last one, which should be 1":

• Does this mean that value 1 actually means correctly fired timer events?
• If value is 0, that means the timer events is missed. Then, should we say this below instead?
  if (missed == 0) info->wakeups_missed +=1;

Cheers,
Paul