[BRLTTY] Virtual driver is not reading the socket

[Dave Mielke]

[quoted lines by Jaroslav Skarvada on 2016/05/12 at 05:52 -0400]

>Thanks, it works for me.

Good, I'll commit it.

>But isn't more clean to just partially revert the commit (change while/do to
>do/while), i.e. the previous patch?

No, there was a reason for the change. The order of the three actions is 
important, and the current order is correct.

1) Test the condition. This must occur before the first wait.
2) Test the timeout. This must occur before the next wait.
3) Wiat for something to do.

The bug was that the timeout was being tested even before the first wait.

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