RELEASE: msg_multipart_t::mp_len from usize_t to unsigned
RELEASE: msg_multipart_t::mp_len from usize_t to unsigned

darcs-hash:20090126154530-db55f-b29418fc282c7ece2f996a672064caa05cda3512.gz

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