Merge r1775173 from trunk:

Silence compiler warning:
"686: warning: 'ok' may be used uninitialized in
this function"
This is a false positive, because the value of "ok"
will only be used if stapling_get_cached_response()
sets "rsp" to non-NULL in which case it will always
have set "ok".

Submitted by: rjung
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1775826 13f79535-47bb-0310-9956-ffa450edef68