[PATCH 3/6] ddraw: Set active_device in AddViewport.

[Alexander Dorofeyev]

Also adds checks for NULL current viewport in SetViewport, because active_device 
!= NULL will no longer imply current_viewport != NULL.
---
  dlls/ddraw/device.c   |    2 ++
  dlls/ddraw/viewport.c |   20 ++++++++++++--------
  2 files changed, 14 insertions(+), 8 deletions(-)
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