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>

drivers/staging/wilc1000/linux_wlan.c

@@ -1047,8 +1047,6 @@ static void wilc_set_multicast_list(struct net_device *dev)
 	}
 
 	wilc_setup_multicast_filter(vif, true, (dev->mc.count));
-
-	return;
 }
 
 static void linux_wlan_tx_complete(void *priv, int status)