[libvirt] [PATCH] Fix size reporting for disk pools without partitions

[Cole Robinson]

The attached patch updates parthelper to print size
information for a disk device if it doesn't have any
allocated partitions.

The current code starts by requesting the first partition,
then iterating from there. But if there is no first
partition, that whole info reporting thing never happens :)

Seems to produce desired results for partitioned and
unpartitioned devices.

Thanks,
Cole
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