problem with powertop in -d (dump) mode

[Morten Thunberg Svendsen]

Hi,

I had a problem with powertop run with the -d switch. When no tty was
connected to stdin the select call used in powertop.c would return
immediately instead of waiting for keypress or timeout.

The solution I made was to check for a connected tty on stdin
(filhandle 0) and just sleep if no tty is detected.

To reproduce this bug one can run powertop like this:
$ powertop -d -t 15 < /dev/null
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