Use unsigned bit flags (otherwise the non-zero value to be used is -1).

git-svn-id: http://svn.apache.org/repos/asf/httpd/httpd/trunk@1603863 13f79535-47bb-0310-9956-ffa450edef68
* modules/ssl/ssl_engine_init.c (make_dh_params): Remove redundant
  temporary variable; no functional change.
  (free_dh_params): Add comment.

Submitted by: rpluem, jorton


git-svn-id: http://svn.apache.org/repos/asf/httpd/httpd/trunk@1603915 13f79535-47bb-0310-9956-ffa450edef68