stun_common.c: use SU_SOCKADDR_SIZE() to calculate correct size for sockaddr in stun_send_message()
stun_common.c: use SU_SOCKADDR_SIZE() to calculate correct size for sockaddr in stun_send_message()

Problem reported by Konstantin Belousov.

darcs-hash:20061128104026-65a35-f847aef84a273dcf976796d1a8024b46f1d61b96.gz

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