Fix: (long should be *plenty*!)

 apreq_module_cgi.c:103:16: warning: comparison of unsigned expression >= 0 is always true [-Wtautological-compare]
    while (--p >= 0) {
           ~~~ ^  ~
    1 warning generated.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1498909 13f79535-47bb-0310-9956-ffa450edef68