qcow2-refcount: Snapshot update for zero clusters
Account for all cluster types in qcow2_update_snapshot_refcounts; this prevents this function from updating the refcount of unallocated zero clusters which effectively led to wrong adjustments of the refcount of cluster 0 (the main qcow2 header). This in turn resulted in images with (unallocated) zero clusters having a cluster 0 refcount greater than one after creating a snapshot. Signed-off-by: NMax Reitz <mreitz@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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