sres_sip.c: fix warnings
sres_sip.c: fix warnings

Ignore-this: d262ce18ca3d40e51afbc9104a26be0f

darcs-hash:20090226153943-11237-e3bfb01569d9d94e836dd61cd499752510518464.gz

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