net/mlx5: HWS, Fix memory leak in hws_pool_buddy_init error path

[ Upstream commit 2c0a959 ]

In the error path of hws_pool_buddy_init(), the buddy allocator cleanup
doesn't free the allocator structure itself, causing a memory leak.

Add the missing kfree() to properly release all allocated memory.

Fixes: c61afff ("net/mlx5: HWS, added memory management handling")
Signed-off-by: Lama Kayal <lkayal@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Mark Bloch <mbloch@nvidia.com>
Link: https://patch.msgid.link/20250825143435.598584-2-mbloch@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

Author: lkayal-01

drivers/net/ethernet/mellanox/mlx5/core/steering/hws/pool.c

@@ -124,6 +124,7 @@ static int hws_pool_buddy_init(struct mlx5hws_pool *pool)
 		mlx5hws_err(pool->ctx, "Failed to create resource type: %d size %zu\n",
 			    pool->type, pool->alloc_log_sz);
 		mlx5hws_buddy_cleanup(buddy);
+		kfree(buddy);
 		return -ENOMEM;
 	}