* subversion/libsvn_ra_serf/serf.c
  (ra_serf_dup_session): Following up on r1552325, rely on the check in
    svn_ra_dup_session() instead of checking again (and causing a linking
    problem).


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1552436 13f79535-47bb-0310-9956-ffa450edef68