* subversion/libsvn_repos/log.c
  (detect_changed): Explicitly pass NULL for authz when there is none.
                    This makes it easier for compilers to employ
                    constant propagation and eliminate used code paths.


git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/authzperf@1617686 13f79535-47bb-0310-9956-ffa450edef68