A previous commit c0828e50 ("selinux:
process labeled IPsec TCP SYN-ACK packets properly in
selinux_ip_postroute()") mistakenly left out a 'break' from a switch
statement which caused problems with IPv6 traffic.

Thanks to Florian Westphal for reporting and debugging the issue.
Reported-by: NFlorian Westphal <fwestpha@redhat.com>
Signed-off-by: NPaul Moore <pmoore@redhat.com>