dxva2: fix the DeviceManager creation when in direct rendering

Using HW rendering was failing with D3D9 vout because of this.
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/codec/avcodec/dxva2.c

@@ -352,7 +352,7 @@ static int Open(vlc_va_t *va, AVCodecContext *ctx, enum PixelFormat pix_fmt,
     if (p_sys!=NULL)
         IDirect3DSurface9_GetDevice(p_sys->surface, (IDirect3DDevice9**) &dx_sys->d3ddev );
 
-    err = directx_va_Open(va, &sys->dx_sys, ctx, fmt, dx_sys->d3ddev==NULL);
+    err = directx_va_Open(va, &sys->dx_sys, ctx, fmt, true);
     if (err!=VLC_SUCCESS)
         goto error;