Fix typo in SetWindowPos32.

diff --git a/windows/winpos.c b/windows/winpos.c
index 2fb256b..13711a6 100644
--- a/windows/winpos.c
+++ b/windows/winpos.c
@@ -2115,7 +2115,7 @@
        {
 	 WND* wnd = WIN_FindWndPtr(hwndInsertAfter);
 
-	 if( wndPtr ) {
+	 if( wnd ) {
 	   if( wnd->parent != wndPtr->parent ) return FALSE;
 	   if( wnd->next == wndPtr ) flags |= SWP_NOZORDER;
 	 }