bonding: do not assume skb mac_header is set
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2218142
Signed-off-by: Hangbin Liu haliu@redhat.com
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2218142
Signed-off-by: Hangbin Liu haliu@redhat.com