HFSC drop count bug

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Hi Patrick

I found a small bug in HFSC (Hierarchical Fair Service Curve).

When attaching a pfifo qdisc to an HFSC class, the dropped packets are not
reported by the tc class output.

 tc class output command:  'tc -s class show dev ethX'

When using a sfq qdisc, the drop count is correct.

Hilsen
  Jesper Brouer

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