nsh: Restore skb->{protocol,data,mac_header} for outer header in nsh_gso_segment().
JIRA: https://issues.redhat.com/browse/RHEL-39772 CVE: CVE-2024-36933 Tested: compile only
The first patch is to resolve the context conflicts.
Signed-off-by: Xin Long lxin@redhat.com