wined3d: Restore the display mode when releasing a swapchain.
diff --git a/dlls/wined3d/wined3d_private.h b/dlls/wined3d/wined3d_private.h
index c20532e..3a2ee8a 100644
--- a/dlls/wined3d/wined3d_private.h
+++ b/dlls/wined3d/wined3d_private.h
@@ -1318,6 +1318,7 @@
     BOOL                      wantsDepthStencilBuffer;
     D3DPRESENT_PARAMETERS     presentParms;
     DWORD                     orig_width, orig_height;
+    WINED3DFORMAT             orig_fmt;
 
     long prev_time, frames;   /* Performance tracking */