Revert "net/mlx5e: fix double free of encap_header"

This reverts commit 6f9b1a07.

This patch is causing a null ptr issue, the proper fix is in the next
patch.

Fixes: 6f9b1a07 ("net/mlx5e: fix double free of encap_header")
Signed-off-by: Vlad Buslov <vladbu@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>