get_block_info returns the same values for capacity and allocation

[ozjonesy]

get_block_info is returning the same values for capacity and allocation. virsh domblkinfo reports different values.

example output from get_block_info:
BlockInfo { capacity: 107374182400, allocation: 107374182400, physical: 107374182400 }

The same info from virsh domblkinfo:
Capacity: 107374182400
Allocation: 12066435072
Physical: 107390828544

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