Fixed invalid check by nua_stack_init_instance() in nua/nua_params.c.
Fixed invalid check by nua_stack_init_instance() in nua/nua_params.c.

darcs-hash:20060503135441-65a35-269ddc0d3b1ddd5e75aaa420e6d972713298dbea.gz

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