staging: wilc1000: fix return error code

Three argument are checked at the beginning of wilc_mq_send whether
they are valid arguments or not. It is correct to use return error code
as -EINVAL, not -EFAULT.
Signed-off-by: Chaehyun Lim <chaehyun.lim@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wilc1000/wilc_msgqueue.c

@@ -61,7 +61,7 @@ int wilc_mq_send(struct message_queue *mq,
 
 	if ((!mq) || (send_buf_size == 0) || (!send_buf)) {
 		PRINT_ER("mq or send_buf is null\n");
-		return -EFAULT;
+		return -EINVAL;
 	}
 
 	if (mq->exiting) {