We need a GSO type for IPsec ESP to be able to integrate the IPsec hardware offloading infrastructure. Unfortunately, all gso_type flags are currently in use. This change extends gso_type from 'unsigned short' to 'unsigned int'.
I'm sending this as a separate patch because it touches one of the core networking structures, so I don't want to merge this together with the IPsec hardware offloading infrastructure via the ipsec-next tree.
