Avoid compiler warning due to incorrect casting.
Avoid compiler warning due to incorrect casting.

darcs-hash:20061218103325-7659e-66818d3a17af876ff17a1cafd061d144cee359a9.gz

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