wiaservc: Return pointer to vtbl instead of implementation in wiadevmgr_Constructor.

[Sebastian Lackner]

This patch also removes unnecessary casts by using the correct type instead of IUnknown/LPVOID.

---
 dlls/wiaservc/factory.c          | 8 ++++----
 dlls/wiaservc/wiadevmgr.c        | 4 ++--
 dlls/wiaservc/wiaservc_private.h | 2 +-
 3 files changed, 7 insertions(+), 7 deletions(-)
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