[PATCH] tokenring: fix module_init error handling

- Call platform_driver_unregister() before return when no cards found.
  (fixes data corruption when no cards found)

- Check platform_device_register_simple() return value

Cc: Jeff Garzik <jgarzik@pobox.com>
Cc: Mike Phillips <mikep@linuxtr.net>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>

 drivers/net/tokenring/proteon.c |    9 +++++++--
 drivers/net/tokenring/skisa.c   |    9 +++++++--
 2 files changed, 14 insertions(+), 4 deletions(-)
Signed-off-by: Jeff Garzik <jeff@garzik.org>