rem: DBG("DEBUG: sh_clean_hdr_field : unknown headers\n");
context: void sh_clean_hdr_field(struct hdr_field* hf){   if (hf->parsed)   {      switch(hf->type)      {         case HDR_VIA:   DBG("DEBUG: sh_clean_hdr_field: sip_msg_free : via headers\n");               sh_free_via_list(hf->parsed);             break;         case HDR_CSEQ:   DBG("DEBUG: sh_clean_hdr_field : cseq headers\n");                sh_free(hf->parsed);             break;         default:   DBG("DEBUG: sh_clean_hdr_field : unknown headers\n");      }   }}