[PATCH] Char: istallion, change init sequence

Reorganizate module init and exit and implement logic, when something fails in
these functions.  The former is needed for proper handling dynamic
tty_register_device.

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>