comctl32: Fixed (harmless) typo.
diff --git a/dlls/comctl32/treeview.c b/dlls/comctl32/treeview.c
index cf04d4b..df71326 100644
--- a/dlls/comctl32/treeview.c
+++ b/dlls/comctl32/treeview.c
@@ -565,7 +565,7 @@
     TRACE("code:%d action:%x olditem:%p newitem:%p\n",
 	  code, action, oldItem, newItem);
 
-    ZeroMemory(&nmhdr, sizeof(NMTREEVIEWA));
+    ZeroMemory(&nmhdr, sizeof(NMTREEVIEWW));
 
     nmhdr.hdr.hwndFrom = hwnd;
     nmhdr.hdr.idFrom = GetWindowLongPtrW(hwnd, GWLP_ID);