[PATCH] libertas: get rid of libertas_sbi_get_priv()

It's not really needed, because we can call wlan_remove_card() with
wlan_private* anyway.

Signed-off-by: Holger Schurig <hs4233@mail.mn-solutions.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>