Minor dlls/comctl32/tests/listview.c simplification

[Gerald Pfeifer]

ChangeLog:
Remove variable hwndheader which is not really used from test_items.

diff --git a/dlls/comctl32/tests/listview.c b/dlls/comctl32/tests/listview.c
index 2c5ef70..06f2ddd 100644
--- a/dlls/comctl32/tests/listview.c
+++ b/dlls/comctl32/tests/listview.c
@@ -1182,7 +1182,7 @@ static void test_items(void)
 
 static void test_columns(void)
 {
-    HWND hwnd, hwndheader;
+    HWND hwnd;
     LVCOLUMN column;
     DWORD rc;
     INT order[2];
@@ -1207,7 +1207,6 @@ static void test_columns(void)
 
     /* LVM_GETCOLUMNORDERARRAY */
     hwnd = create_listview_control(LVS_REPORT);
-    hwndheader = subclass_header(hwnd);
 
     memset(&column, 0, sizeof(column));
     column.mask = LVCF_WIDTH;