[Click] ToDevice stats problem

[Nikitas Liogkas]

It seems to me that some of the ToDevice stats are wrong! Specifically 
_npackets now holds the number of packets pulled from the upstream queue, 
and _pulls is incremented _before_ pull() is called, so it is incremented 
even on an unsuccessful pull!

Here is a patch that makes more sense to me: _npackets now holds the number 
of sent packets, and _pulls the number of pulled packets. Given that 
_rejected holds the number of rejected packets, it is now true that _pulls = 
_npackets + _rejected.

nikitas
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