qcow2: Reuse refcount table in calculate_refcounts()
We will later call calculate_refcounts multiple times, so reuse the refcount table if possible. Signed-off-by: NMax Reitz <mreitz@redhat.com> Reviewed-by: NBenoît Canet <benoit.canet@nodalink.com> Reviewed-by: NKevin Wolf <kwolf@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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