staging: wilc1000: removes void function return

This patch removes the warning reported by checkpatch.pl
for void function return statements are not generally useful.

Signed-off-by: Leo Kim <leo.kim@atmel.com>
Signed-off-by: Glen Lee <glen.lee@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>