qemu-img: do not zero-pad the compressed write buffer
bdrv_write_compressed() does not allow requests that span the end of the device. Therefore it is useless to zero-pad the last cluster and thereby exceed the end of the device. Let image formats handle zero-padding the final compressed cluster, if necessary. Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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