Revert "tty: don't panic on OOM in tty_set_ldisc()"

Revert "tty: don't panic on OOM in tty_set_ldisc()"

This reverts commit 6dd97aecf4f5ed2619907d15c025974aa5f8420a as it is
reported to cause a reproducable crash.

Fixes: 6dd97aecf4f5 ("tty: don't panic on OOM in tty_set_ldisc()")
Reported-by: Vegard Nossum <vegard.nossum@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: <syzkaller@googlegroups.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: Peter Hurley <peter@hurleysoftware.com>
Cc: One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org