lockref: Add lockref_put_not_zero
Put a lockref unless the lockref is dead or its count would become zero. This is the same as lockref_put_or_lock except that the lock is never left held. Signed-off-by: NAndreas Gruenbacher <agruenba@redhat.com> Signed-off-by: NBob Peterson <rpeterso@redhat.com>
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