Merge r1658567 from trunk

   * mod_authn_dbd: Precedence issue. Fix the error message logged in case of
     error while querying the database.

Submitted by: jailletc36
Reviewed by: jailletc36, mrumph, minfrin
Backported by: jailletc36

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1661456 13f79535-47bb-0310-9956-ffa450edef68