Bail out earlier in the case of an error with limit data.

Cleanup bit isn't needed if svn_repos_get_logs4() is never called.

* subversion/mod_dav_svn/reports/log.c
  (dav_svn__log_report): Return immediately on err converting limit cdata to
    int.

Patch by: philip


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1459599 13f79535-47bb-0310-9956-ffa450edef68