Remove mark_ttys function and fix tty_display_info initialization.

* lisp.h (mark_ttys): Remove prototype.
* alloc.c (Fgarbage_collect): Remove redundant (and the only) call
to mark_ttys because all possible values of 'top_frame' slot are
the frames which are reachable from Vframe_list.
* term.c (mark_ttys): Remove.
(init_tty): Safely initialize 'top_frame' slot with Qnil.

1 files changed, 0 insertions, 1 deletions

diff --git a/src/alloc.c b/src/alloc.c
index 36ba22cc535..e8637471bc7 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -5476,7 +5476,6 @@ See Info node `(elisp)Garbage Collection'.  */)
     }
   mark_terminals ();
   mark_kboards ();
-  mark_ttys ();
 
 #ifdef USE_GTK
   {