net/mlx5e: Avoid referencing skb after free-ing in drop path of mlx5e_sq_xmit_wqe

net/mlx5e: Avoid referencing skb after free-ing in drop path of mlx5e_sq_xmit_wqe

When SQ is a port timestamping SQ for PTP, do not access tx flags of skb
after free-ing the skb. Free the skb only after all references that depend
on it have been handled in the dropped WQE path.

Fixes: 3178308ad4ca ("net/mlx5e: Make tx_port_ts logic resilient to out-of-order CQEs")
Signed-off-by: Rahul Rameshbabu <rrameshbabu@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Link: https://lore.kernel.org/r/20231114215846.5902-10-saeed@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>