setupapi: Create an empty list when getting device interface classes.

[Kevin Koltzau]

Windows returns an empty list for unknown GUIDs, some apps assume
success and get into an infinite loop enumerating interfaces
---
 dlls/setupapi/devinst.c |   28 ++++++++++++++++++++++++----
 1 files changed, 24 insertions(+), 4 deletions(-)
-------------- next part --------------
A non-text attachment was scrubbed...
Name: c81a525bae37448dc9d88f14f90a7b7a0a8685fb.diff
Type: text/x-patch
Size: 1907 bytes
Desc: not available
Url : http://www.winehq.org/pipermail/wine-patches/attachments/20060804/cd5d5733/c81a525bae37448dc9d88f14f90a7b7a0a8685fb.bin