'ap_getword_conf' does not return NULL but an empty string if nothing could be gotten.
So the message 02173 can never trigger.

Actually, this is not a problem because all calls to 'ap_unixd_set_rlimit' are done in configuration parsing functions guarded with AP_INIT_TAKE12, so we are guaranteed to have something.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1551005 13f79535-47bb-0310-9956-ffa450edef68