mod_remoteip: close file in error path

trunk patch: http://svn.apache.org/r1491234
Submitted by: jailletc36
Reviewed by: covener, minfrin


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1491464 13f79535-47bb-0310-9956-ffa450edef68