staging: wilc1000: define a new local variable in wilc_scan

struct scan_info is defined as a new local variable in wilc_scan
function. It makes some assignment short as well as improve more
readability.

Signed-off-by: Chaehyun Lim <chaehyun.lim@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>