[PATCH] libertas: remove adapter->scantype

scantype was initialized with CMD_SCAN_TYPE_ACTIVE, but there is no code
that would ever change it, so we can use that variable directly.

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