staging: wilc1000: handle_cfg_param: change data type of wid_cnt

This patch changes data type of wid_cnt from u8 to int.
This variable uses array index of struct wid_list so that it is better
to use int type.

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