soa.c: fix address matching with user sdp w/out session c
soa.c: fix address matching with user sdp w/out session c

Ignore-this: 9aa560f8abd799d46e38c2e4ee0ca23c

darcs-hash:20090226151552-db55f-ecb3499371cbe779ac0b83d1643420d7da787808.gz

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