Staging: wilc1000: wilc_wlan: Remove unnecessary cast

Remove cast which is not required.
Semantic patch used:
@@
type T;
T e;
identifier x;
@@

* T x = (T)e;

Signed-off-by: Shivani Bhardwaj <shivanib134@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>