Undo recent tty_io.c "fix".

The fix was just trying to hide the real bug, which was in
an old udev script. The change made matters worse.

Cset exclude: pavenis@latnet.lv[torvalds]|ChangeSet|20050202164823|05506

drivers/char/tty_io.c

@@ -1156,7 +1156,7 @@ static inline void pty_line_name(struct tty_driver *driver, int index, char *p)
 	int i = index + driver->name_base;
 	/* ->name is initialized to "ttyp", but "tty" is expected */
 	sprintf(p, "%s%c%x",
-		driver->subtype == PTY_TYPE_SLAVE ? "pty" : driver->name,
+			driver->subtype == PTY_TYPE_SLAVE ? "tty" : driver->name,
 			ptychar[i >> 4 & 0xf], i & 0xf);
 }