nta.c: sanity checks for fork()ed cases
nta.c: sanity checks for fork()ed cases

Ignore-this: f384a65929393f36012f433292a73a91

darcs-hash:20090514180125-db55f-88201c3e70fc4f97b2dfa466472833bac217657d.gz

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