Exclude the terminating null byte from the length of

strings passed to apr_hash_get/apr_hash_set (this matches
the convention used throughout the rest of the httpd,
and it saves a small amount of processing)


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@92283 13f79535-47bb-0310-9956-ffa450edef68