staging: wilc1000: fix return type of host_int_set_wfi_drv_handler

This patch changes return type of host_int_set_wfi_drv_handler from s32
to int. s32Error gets return value from wilc_mq_send that has return
type of int. It should be changed return type by int as well as data
type of s32Error.

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