net/mlx5e: add missing error code in error path

Add missing error code when mlx5e_macsec_fs_add_rule() or
mlx5e_macsec_fs_init() fails. mlx5e_macsec_fs_init() don't
return ERR_PTR(), so replace IS_ERR_OR_NULL() check with
NULL pointer check.

Fixes: e467b283 ("net/mlx5e: Add MACsec TX steering rules")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Acked-by: Saeed Mahameed <saeedm@nvidia.com>
Link: https://lore.kernel.org/r/20220914140100.3795545-1-yangyingliang@huawei.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/mellanox/mlx5/core/en_accel/macsec.c

@@ -194,8 +194,10 @@ static int mlx5e_macsec_init_sa(struct macsec_context *ctx,
 				      MLX5_ACCEL_MACSEC_ACTION_DECRYPT;
 
 	macsec_rule = mlx5e_macsec_fs_add_rule(macsec->macsec_fs, ctx, &rule_attrs, &sa->fs_id);
-	if (IS_ERR_OR_NULL(macsec_rule))
+	if (!macsec_rule) {
+		err = -ENOMEM;
 		goto destroy_macsec_object;
+	}
 
 	sa->macsec_rule = macsec_rule;
 
@@ -1294,8 +1296,10 @@ int mlx5e_macsec_init(struct mlx5e_priv *priv)
 	macsec->mdev = mdev;
 
 	macsec_fs = mlx5e_macsec_fs_init(mdev, priv->netdev);
-	if (IS_ERR_OR_NULL(macsec_fs))
+	if (!macsec_fs) {
+		err = -ENOMEM;
 		goto err_out;
+	}
 
 	macsec->macsec_fs = macsec_fs;