rnbd-srv: make process_msg_close returns void

Change the return type to void given it always returns 0.
Signed-off-by: Guoqing Jiang <guoqing.jiang@linux.dev>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Acked-by: Md Haris Iqbal <haris.iqbal@ionos.com>
Link: https://lore.kernel.org/r/20220902100055.25724-3-guoqing.jiang@linux.devSigned-off-by: Jens Axboe <axboe@kernel.dk>

drivers/block/rnbd/rnbd-srv.c

@@ -339,7 +339,7 @@ void rnbd_srv_sess_dev_force_close(struct rnbd_srv_sess_dev *sess_dev,
 	mutex_unlock(&sess->lock);
 }
 
-static int process_msg_close(struct rnbd_srv_session *srv_sess,
+static void process_msg_close(struct rnbd_srv_session *srv_sess,
 			     void *data, size_t datalen, const void *usr,
 			     size_t usrlen)
 {
@@ -351,13 +351,12 @@ static int process_msg_close(struct rnbd_srv_session *srv_sess,
 	sess_dev = rnbd_get_sess_dev(le32_to_cpu(close_msg->device_id),
 				      srv_sess);
 	if (IS_ERR(sess_dev))
-		return 0;
+		return;
 
 	rnbd_put_sess_dev(sess_dev);
 	mutex_lock(&srv_sess->lock);
 	rnbd_srv_destroy_dev_session_sysfs(sess_dev);
 	mutex_unlock(&srv_sess->lock);
-	return 0;
 }
 
 static int process_msg_open(struct rnbd_srv_session *srv_sess,
@@ -387,7 +386,7 @@ static int rnbd_srv_rdma_ev(void *priv,
 	case RNBD_MSG_IO:
 		return process_rdma(srv_sess, id, data, datalen, usr, usrlen);
 	case RNBD_MSG_CLOSE:
-		ret = process_msg_close(srv_sess, data, datalen, usr, usrlen);
+		process_msg_close(srv_sess, data, datalen, usr, usrlen);
 		break;
 	case RNBD_MSG_OPEN:
 		ret = process_msg_open(srv_sess, usr, usrlen, data, datalen);