staging: wilc1000: fix a typo: "incative" -> "inactive"

Trivial fix to typos in netdev_err error messages. I should have spotted
this in a previous round of spelling mistake checks on this driver but
this one slipped through.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>