http_add_tl() now accepts NULL http struct pointer.
http_add_tl() now accepts NULL http struct pointer.

darcs-hash:20060331153712-88462-5cb3d94a910535475d0839378250f94e7c99ff26.gz

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