Merge r1364229 from trunk:

Correctly log the error returned by apr_dbd_pvselect()

Submitted by: sf
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1373087 13f79535-47bb-0310-9956-ffa450edef68