nua_params.c: fixed preference tag filter
nua_params.c: fixed preference tag filter

darcs-hash:20061101152759-65a35-1d3e882d13d5b3b3f6b039fec248e04dfc082c7a.gz

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