[4.9.y,netfilter] please, cherry-pick da2f27e9e615

[Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>]

Resending this, I used the wrong stable email address.

-o-

Hi,

Please, 4.9 stable maintainer, cherry-pick this commit:

commit da2f27e9e615d1c799c9582b15262458da61fddc
Author: Christophe Leroy <christophe.leroy@xxxxxx>
Date:   Wed Mar 1 15:33:26 2017 +0100

    netfilter: nf_conntrack_sip: fix wrong memory initialisation

We have a user complaining about this bug that manifests in 4.9:

http://marc.info/?l=netfilter&m=149577235017072&w=2

Thanks!