[PATCH 06/10] devenum: Move locating category key to function, use it ParseDisplayName.

[Alexander Dorofeyev]

This function also will be used in legacy filter (re)registration added in next 
patch.

Using this function in ParseDisplayName instead of CreateClassEnumerator for a 
single purpose of finding needed registry key also prevents a circular recursion 
in the code added in next patch (ICreateDevEnum_CreateClassEnumerator - 
registration subroutine - IFilterMapper2_RegisterFilter - 
IParseDisplayName_ParseDisplayName - again ICreateDevEnum_CreateClassEnumerator).
---
  dlls/devenum/createdevenum.c    |   58 +++++++++++++++++++++++----------------
  dlls/devenum/devenum_private.h  |    5 +++
  dlls/devenum/parsedisplayname.c |   18 +++++-------
  3 files changed, 47 insertions(+), 34 deletions(-)
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