sres.c: small fixes with size_t usage.
sres.c: small fixes with size_t usage.

Note that sresolv module tries very hard not to depend on <sofia-sip/su.h>.

darcs-hash:20060911123956-65a35-45c4a61d32fc1d119d8f4c116ddfb673d1ec7d98.gz

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