In mod_dav_svn remove some unneeded wrapping of error messages with the
error message itself. This also fixes a possible pool lifetime issue on
these messages.

* subversion/mod_dav_svn/reports/file-revs.c
  (dav_svn__file_revs_report):

* subversion/mod_dav_svn/reports/get-location-segments.c
  (dav_svn__get_location_segments_report):

* subversion/mod_dav_svn/reports/get-locations.c
  (dav_svn__get_locations_report):

* subversion/mod_dav_svn/reports/inherited-props.c
  (dav_svn__get_inherited_props_report):

* subversion/mod_dav_svn/reports/log.c
  (dav_svn__log_report):

* subversion/mod_dav_svn/reports/mergeinfo.c
  (dav_svn__get_mergeinfo_report): Don't wrap messages with err->message. This
    makes the conversion do extra work and the message may not even live until
    the message is printed as the error is cleared before that.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1553868 13f79535-47bb-0310-9956-ffa450edef68