d3dx9_36/tests: free memory after use (Valgrind)

[Austin English]

Fixes:
 16 bytes in 1 blocks are definitely lost
    at  notify_alloc (heap.c:254)
    by  RtlAllocateHeap (heap.c:1701)
    by  D3DXCreateBuffer (core.c:113)
    by  D3DXCreateBoxTest (mesh.c:1398)
    by  func_mesh (mesh.c:2113)
    by  run_test (test.h:556)
    by  main (test.h:624)

-- 
-Austin
-------------- next part --------------
diff --git a/dlls/d3dx9_36/tests/mesh.c b/dlls/d3dx9_36/tests/mesh.c
index 5d1425b..05d68eb 100644
--- a/dlls/d3dx9_36/tests/mesh.c
+++ b/dlls/d3dx9_36/tests/mesh.c
@@ -1417,6 +1417,7 @@ static void D3DXCreateBoxTest(void)
 end:
     IDirect3DDevice9_Release(device);
     IDirect3D9_Release(d3d);
+    ID3DXBuffer_Release(ppBuffer);
     DestroyWindow(wnd);
 }