soa.c: fix build on non-ipv6 hosts
soa.c: fix build on non-ipv6 hosts

Ignore-this: f7b1d9f668883ffffea328af7dff83e8

darcs-hash:20090226151843-11237-bc9d9afe5ce3b644e03329ac35f4db039eaf8f10.gz

BelledonneCommunications/sofia-sip,erdincay/sofia-sip,xhook/sofia-sip,unispeech/sofia-sip,jart/sofia-sip,jart/sofia-sip,xhook/sofia-sip,unispeech/sofia-sip,xhook/sofia-sip,BelledonneCommunications/sofia-sip,unispeech/sofia-sip,erdincay/sofia-sip,BelledonneCommunications/sofia-sip,jart/sofia-sip,xhook/sofia-sip,unispeech/sofia-sip,erdincay/sofia-sip,xhook/sofia-sip,BelledonneCommunications/sofia-sip,erdincay/sofia-sip