Description: netfilter: nf_conntrack_h323: lost .data_len definition for Q.931/ipv6
References:
 https://bugzilla.redhat.com/show_bug.cgi?id=1850716
 https://patchwork.ozlabs.org/project/netfilter-devel/patch/c2385b5c-309c-cc64-2e10-a0ef62897502@virtuozzo.com/
 https://lore.kernel.org/stable/20200624121232.GA28150@salvia/
Notes:
 carnil> In mainline the problem went away after commit 9f0f3ebeda47
 carnil> ("netfilter: helpers: remove data_len usage
 carnil> for inkernel helpers") in 4.12-rc1.
Bugs:
upstream: released (4.12-rc1) [9f0f3ebeda47a5518817f33c40f6d3ea9c0275b8]
4.19-upstream-stable: N/A "Fixed before branching point"
4.9-upstream-stable: released (4.9.230) [396ba2fc4f27ef6c44bbc0098bfddf4da76dc4c9]
3.16-upstream-stable: ignored "EOL"
sid: released (4.12.6-1)
4.19-buster-security: N/A "Fixed before branching point"
4.9-stretch-security: released (4.9.240-1)
3.16-jessie-security: ignored "EOL"