Remove warnings

mod_speling.c:400:41: warning: data argument not used by format string [-Wformat-extra-args]
                          r->uri, nuri, ref);
                                                                                                                        mod_speling.c:508:53: warning: data argument not used by format string [-Wformat-extra-args]
                          r->uri, candidates->nelts, ref);

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1407460 13f79535-47bb-0310-9956-ffa450edef68