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.
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