Make read_chan be symmetric with tty_check_change.

--- drivers/char/n_tty.c 11 Oct 2003 22:14:12 -0000 1.2
+++ drivers/char/n_tty.c 10 Feb 2004 06:33:05 -0000
@@ -956,7 +956,8 @@
current->tty == tty) {
if (tty->pgrp <= 0)
printk("read_chan: tty->pgrp <= 0!\n");
- else if (current->pgrp != tty->pgrp) {
+ else if ((current->pgrp != tty->pgrp) &&
+ (tty->device != MKDEV(TTY_MAJOR,65))) {
if (is_ignored(SIGTTIN) ||
is_orphaned_pgrp(current->pgrp))
return -EIO;