NetworkPkg/TcpDxe: fix SockFreeFoo() parameter list

NetworkPkg/TcpDxe: fix SockFreeFoo() parameter list

The SockFreeFoo() callback function for NetbufFromExt() has to match the
NET_VECTOR_EXT_FREE prototype, which takes a (VOID*) as callback argument
(Arg). EFI_EVENT has nothing to do with NET_VECTOR_EXT_FREE. Fix the
SockFreeFoo() parameter list.

This change is a no-op in practice.

Cc: Jiaxin Wu <jiaxin.wu@intel.com>
Cc: Siyuan Fu <siyuan.fu@intel.com>
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Philippe Mathieu-Daude <philmd@redhat.com>
Reviewed-by: Siyuan Fu <siyuan.fu@intel.com>