staging: wilc1000: handle_cfg_param: rename wid_cnt

wid_cnt variable is used as indicating array index of struct wid_list.
This patch renames wid_cnt to i that makes more readability.

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