net/mlx5: Fix memory leak on flow table creation error flow

stable inclusion
from linux-4.19.173
commit 8cbe9e3567ab4dea3e05e8cf791b5f6e6fdf8c9c

--------------------------------

[ Upstream commit 487c6ef8 ]

When we create the ft object we also init rhltable in ft->fgs_hash.
So in error flow before kfree of ft we need to destroy that rhltable.

Fixes: 693c6883 ("net/mlx5: Add hash table for flow groups in flow table")
Signed-off-by: NRoi Dayan <roid@nvidia.com>
Reviewed-by: NMaor Dickman <maord@nvidia.com>
Signed-off-by: NSaeed Mahameed <saeedm@nvidia.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>
Signed-off-by: NAichun Li <liaichun@huawei.com>
reviewed-by: Nwangxiaopeng <wangxiaopeng7@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>
Signed-off-by: NCheng Jian <cj.chengjian@huawei.com>

drivers/net/ethernet/mellanox/mlx5/core/fs_core.c

@@ -1004,6 +1004,7 @@ static struct mlx5_flow_table *__mlx5_create_flow_table(struct mlx5_flow_namespa
 destroy_ft:
 	root->cmds->destroy_flow_table(root->dev, ft);
 free_ft:
+	rhltable_destroy(&ft->fgs_hash);
 	kfree(ft);
 unlock_root:
 	mutex_unlock(&root->chain_lock);