comctl32/tests: Fix compilation on systems that don't support nameless unions.

[Francois Gouget]

---
 dlls/comctl32/tests/treeview.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/dlls/comctl32/tests/treeview.c b/dlls/comctl32/tests/treeview.c
index 5ef277c..653807f 100644
--- a/dlls/comctl32/tests/treeview.c
+++ b/dlls/comctl32/tests/treeview.c
@@ -1425,14 +1425,14 @@ static void test_htreeitem_layout(void)
 
     ins.hParent = hChild;
     ins.hInsertAfter = TVI_FIRST;
-    ins.item.mask = 0;
+    U(ins).item.mask = 0;
     item1 = TreeView_InsertItem(hTree, &ins);
 
     check_item(item1, hChild, 0, 0);
 
     ins.hParent = hRoot;
     ins.hInsertAfter = TVI_FIRST;
-    ins.item.mask = 0;
+    U(ins).item.mask = 0;
     item2 = TreeView_InsertItem(hTree, &ins);
 
     check_item(item2, hRoot, hChild, 0);
-- 
1.7.2.3