Get rid of unnecessary apr_status_t variables in a couple of functions.

In load_file(), use apr_dso_error() instead of apr_strerror() to build
an error message after a apr_dso_load() failure.

PR:			6980


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@88444 13f79535-47bb-0310-9956-ffa450edef68