Following up on r1553809, fix some more variable references.

* subversion/libsvn_ra_serf/property.c
  (propfind_opened,
   create_propfind_body): Update caller.

* subversion/libsvn_ra_serf/serf.c
  (svn_ra_serf__rev_prop,
   get_dirent_props): Update caller.

* subversion/libsvn_ra_serf/update.c
  (start_report,
   end_report): Update caller.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1553853 13f79535-47bb-0310-9956-ffa450edef68