Hi,

  I found bug in tc (wrong using of qdisc/filter will cause seg fault):
   tc qdisc add u32 help        // u32 is filter
  
  In function get_qdisc_kind (get_filter_kind) we search for struct
  qdisc_util (filter_util) with name *_util (in example for u32 is 
  u32_util - it's ok, but it isn't qdisc)

  My suggestion is to change name to:
   *_utilQ (for qdisc)
   *_utilF (for filter)

  then if we search for qdisc we won't get filter (and vice versa).
  See patch.
  
  I've tested it on version 2.4.7 (ss010824 and ss020116-try), but the bug
  should also affect older versions.
   
  I wrote to A. Kuznetsov, but I didn't get response. Maybe my email
  lost or something else ;)

  Best regards
  Jarek
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