nua_event_server.c: free temp strings
nua_event_server.c: free temp strings

Ignore-this: 18b592f7d6ae942a48cd117f7a6f3c31

Coverity issue.

darcs-hash:20090513171418-db55f-b3889890e23d2c8625dd4dd877e80f74ceca8616.gz

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