* term.c (get_named_tty, create_tty_output, tty_free_frame_resources)

* term.c (get_named_tty, create_tty_output, tty_free_frame_resources)
(tty_free_frame_resources, delete_tty): Prefer eassert to emacs_abort.
* image.c (make_image_cache): For struct image_cache, prefer xmalloc
to xzalloc and so avoid redundant call to memset.
* xterm.c (x_term_init): Avoid unnecessary initializations of dpyinfo
members because it is allocated with xzalloc and so already zeroed.