Updated tport_tls.c.
Updated tport_tls.c.

Not requiring client certificate in tls.
Tried to improve error handling, too.

darcs-hash:20060426173450-65a35-4de45c1062356acb2533d26985c5486de123454f.gz

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