vmdk: Fix partial overwrite of zero cluster
When overwriting a zero cluster, we must not perform copy-on-write from the backing file, but from a zeroed buffer. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Message-Id: <20200430133007.170335-4-kwolf@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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