d3d9/tests: Trace the viewport in clear_test().

There are some failures in this test on Win7 that appear to be related to the
initial viewport. Perhaps this trace will help narrow it down.

dlls/d3d9/tests/visual.c

@@ -495,6 +495,9 @@ static void clear_test(IDirect3DDevice9 *device)
     hr = IDirect3DDevice9_GetViewport(device, &old_vp);
     ok(hr == D3D_OK, "IDirect3DDevice9_GetViewport failed with %08x\n", hr);
 
+    trace("viewport: X %u, Y %u, W %u, H %u, MinZ %.8e, MaxZ %.8e.\n",
+            old_vp.X, old_vp.Y, old_vp.Width, old_vp.Height, old_vp.MinZ, old_vp.MaxZ);
+
     vp.X = 160;
     vp.Y = 120;
     vp.Width = 160;