d3d9/tests: Check another return value in maxmip_test() (LLVM/Clang).

dlls/d3d9/tests/visual.c

@@ -3201,6 +3201,7 @@ static void maxmip_test(IDirect3DDevice9 *device)
         hr = IDirect3DDevice9_DrawPrimitiveUP(device, D3DPT_TRIANGLESTRIP, 2, &quads[3], sizeof(*quads->v));
         ok(SUCCEEDED(hr), "DrawPrimitiveUP failed (%08x)\n", hr);
         hr = IDirect3DDevice9_EndScene(device);
+        ok(SUCCEEDED(hr), "EndScene failed, hr %#x.\n", hr);
     }
 
     /* Max Mip level 0-2 sample from the specified texture level, Max Mip