[PATCH V2] vdpa/mlx5: return correct error code after rte_intr_instance_alloc failed

[835703180 at qq.com]

From: Shiqi Liu <835703180 at qq.com>

To Maxime,
I am so sorry too late to reply your comment.My name is Shiqi Liu.
I got stuck in how to reply the comment before.Now, it seenms to be ok!Maybe there will be some mistakes I have taken ,
when I reply,please tell me how to do it correctly!
Thanks,
Shiqi Liu

diff --git a/drivers/vdpa/mlx5/mlx5_vdpa_event.c b/drivers/vdpa/mlx5/mlx5_vdpa_event.c
index 7167a98db0..6223afaae8 100644
--- a/drivers/vdpa/mlx5/mlx5_vdpa_event.c
+++ b/drivers/vdpa/mlx5/mlx5_vdpa_event.c
@@ -395,6 +395,7 @@ mlx5_vdpa_err_event_setup(struct mlx5_vdpa_priv *priv)
 		rte_intr_instance_alloc(RTE_INTR_INSTANCE_F_SHARED);
 	if (priv->err_intr_handle == NULL) {
 		DRV_LOG(ERR, "Fail to allocate intr_handle");
+		rte_errno = ENOMEM;
 		goto error;
 	}
 	if (rte_intr_fd_set(priv->err_intr_handle, priv->err_chnl->fd))
--