Remove extra format argument.

src/sbbs3/websrvr.c

@@ -1323,7 +1323,7 @@ static void send_error(http_session_t * session, const char* message)
 				sprintf(session->req.physical_path,"%s%s.html",error_dir,error_code);
 		}
 		else
-			sprintf(session->req.physical_path,"%s%s.html",error_dir,error_code,startup->ssjs_ext);
+			sprintf(session->req.physical_path,"%s%s.html",error_dir,error_code);
 		session->req.mime_type=get_mime_type(strrchr(session->req.physical_path,'.'));
 		send_headers(session,message,FALSE);
 		if(!stat(session->req.physical_path,&sb)) {