osd: check is_dup earlier; do not set osdop version if it's a noop

osd: check is_dup earlier; do not set osdop version if it's a noop

Otherwise, we end up with a bogus version that's not logged and in the
future, which confuses us later (we think it's a replay or something).  If
it's a noop, that means the version is either already set, or doesn't need
to be.