mir: don't warn if transient_for is NULL

diff --git a/gdk/mir/gdkmirwindowimpl.c b/gdk/mir/gdkmirwindowimpl.c
index 16035a02a4f07a4794a8fd9f968fcd878031640e..25e57c6a1eca30e6dd6eb997f3fbef97fd230903 100644 (file)
--- a/gdk/mir/gdkmirwindowimpl.c
+++ b/gdk/mir/gdkmirwindowimpl.c
@@ -871,8 +871,6 @@ gdk_mir_window_impl_set_transient_for (GdkWindow *window,
   if (impl->transient_for == parent)
     return;
 
-  g_return_if_fail (impl->transient_for == NULL);
-
   /* Link this window to the parent */
   impl->transient_for = parent;
 }