net/mlx5: DR, Fix wrong action data allocation in decap action

net/mlx5: DR, Fix wrong action data allocation in decap action

BugLink: https://bugs.launchpad.net/bugs/2033931
[ Upstream commit ef4c5afc783dc3d47640270a9b94713229c697e8 ]

When TUNNEL_L3_TO_L2 decap action was created, a pointer to a local
variable was passed as its HW action data, resulting in attempt to
free invalid address:

  BUG: KASAN: invalid-free in mlx5dr_action_destroy+0x318/0x410 [mlx5_core]

Fixes: 4781df92f4da ("net/mlx5: DR, Move STEv0 modify header logic")
Signed-off-by: Yevgeny Kliteynik <kliteyn@nvidia.com>
Reviewed-by: Alex Vesker <valex@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>