net/mlx5e: Fix a use after free on error in mlx5_tc_ct_shared_counter_get()

This code frees "shared_counter" and then dereferences on the next line
to get the error code.

Fixes: 1edae233 ("net/mlx5e: CT: Use the same counter for both directions")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.c

@@ -739,6 +739,7 @@ mlx5_tc_ct_shared_counter_get(struct mlx5_tc_ct_priv *ct_priv,
 	struct mlx5_core_dev *dev = ct_priv->dev;
 	struct mlx5_ct_entry *rev_entry;
 	__be16 tmp_port;
+	int ret;
 
 	/* get the reversed tuple */
 	tmp_port = rev_tuple.port.src;
@@ -778,8 +779,9 @@ mlx5_tc_ct_shared_counter_get(struct mlx5_tc_ct_priv *ct_priv,
 	shared_counter->counter = mlx5_fc_create(dev, true);
 	if (IS_ERR(shared_counter->counter)) {
 		ct_dbg("Failed to create counter for ct entry");
+		ret = PTR_ERR(shared_counter->counter);
 		kfree(shared_counter);
-		return ERR_PTR(PTR_ERR(shared_counter->counter));
+		return ERR_PTR(ret);
 	}
 
 	refcount_set(&shared_counter->refcount, 1);