mod_ldap: prevent the possiblity of an infinite loop in the LDAP

statistics display.
PR: 29216
Obtained from:
Submitted by:	Graham Leggett
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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@105373 13f79535-47bb-0310-9956-ffa450edef68