d3d8: Do not modify the "texture" pointer for D3DFMT_UNKNOWN in d3d8_device_CreateCubeTexture().

dlls/d3d8/device.c

@@ -853,6 +853,9 @@ static HRESULT WINAPI d3d8_device_CreateCubeTexture(IDirect3DDevice8 *iface, UIN
     TRACE("iface %p, edge_length %u, levels %u, usage %#x, format %#x, pool %#x, texture %p.\n",
             iface, edge_length, levels, usage, format, pool, texture);
 
+    if (!format)
+        return D3DERR_INVALIDCALL;
+
     *texture = NULL;
     object = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(*object));
     if (!object)

dlls/d3d8/tests/device.c

@@ -8236,7 +8236,7 @@ static void test_format_unknown(void)
     hr = IDirect3DDevice8_CreateCubeTexture(device, 64, 1, 0,
             D3DFMT_UNKNOWN, D3DPOOL_DEFAULT, (IDirect3DCubeTexture8 **)&iface);
     ok(hr == D3DERR_INVALIDCALL, "Got unexpected hr %#x.\n", hr);
-    todo_wine ok(iface == (void *)0xdeadbeef, "Got unexpected iface %p.\n", iface);
+    ok(iface == (void *)0xdeadbeef, "Got unexpected iface %p.\n", iface);
 
     iface = (void *)0xdeadbeef;
     hr = IDirect3DDevice8_CreateVolumeTexture(device, 64, 64, 1, 1, 0,