Reverse the order for deleting the items in resetcontent to correctly
empty a comboboxex.

diff --git a/dlls/user/listbox.c b/dlls/user/listbox.c
index c849afe..c5e3c04 100644
--- a/dlls/user/listbox.c
+++ b/dlls/user/listbox.c
@@ -1706,7 +1706,7 @@
 {
     INT i;
 
-    for (i = 0; i < descr->nb_items; i++) LISTBOX_DeleteItem( descr, i );
+    for(i = descr->nb_items - 1; i>=0; i--) LISTBOX_DeleteItem( descr, i);
     HeapFree( GetProcessHeap(), 0, descr->items );
     descr->nb_items      = 0;
     descr->top_item      = 0;