commit a352def21a642133758b868c71bee12ab34ad5c5 broke pptp.

From: Alexey Zaytsev
Date: Wed Jul 23 2008 - 14:11:20 EST


Pptp brakes for me on the current git (c010b2f76):

root@nx:~# pppd call semunlim defaultroute nodetach debug
Couldn't set tty to PPP discipline: Invalid argument
Waiting for 1 child processes...
script pptp --nolaunchpppd, pid 4359

It bisects to:
a352def21a642133758b868c71bee12ab34ad5c5 tty: Ldisc revamp

Revetring this commit, along with
and 01e1abb2c27e43339b8829a2e3b1c6f53806b77a fixes the problem.
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