wined3d/device.c clear freed pointer

[Lauris Kaplinski]

In IWineD3DDeviceImpl_SetFrontBackBuffers set the backBuffers pointer to 
NULL after
freeing the array.  This fixes crash in startup of Des blood 4.

Lauris Kaplinski

Changelog:
Fixed potential reference to freed backBuffer array in 
IWineD3DDeviceImpl_SetFrontBackBuffers

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