Fix renew_until check for auto-renewal

Fix renew_until check for auto-renewal

This was completely wrong, but only caused a severe problem on 64 bit
builds. On 32 bit builds the result was effectively always 'success',
so it would always attempt to renew even if there was not sufficient time
left in the renewable lifetime. This did not have much observable
adverse effect. But on 64 bit builds it always failed and so never
attempted renewal.

Signed-off-by: Kevin Wasserman <kevin.wasserman@painless-security.com>
ticket: 7326 (new)
queue: kfw
target_version: 1.10.4
tags: pullup