SSL: detect "listen ... ssl" without certificates (ticket #178). In mail and stream modules, no certificate provided is a fatal condition, much like with the "ssl" and "starttls" directives. In http, "listen ... ssl" can be used in a non-default server without certificates as long as there is a certificate in the default one, so missing certificate is only fatal for default servers.

--- a/src/http/ngx_http_core_module.c
+++ b/src/http/ngx_http_core_module.c
@@ -3256,6 +3256,9 @@ ngx_http_core_create_srv_conf(ngx_conf_t
     cscf->merge_slashes = NGX_CONF_UNSET;
     cscf->underscores_in_headers = NGX_CONF_UNSET;
 
+    cscf->file_name = cf->conf_file->file.name.data;
+    cscf->line = cf->conf_file->line;
+
     return cscf;
 }