6f98948 util: Use new array management macros

Authored and Committed by Osier Yang 10 years ago
    util: Use new array management macros
    
    Like commit 94a26c7e from Eric Blake, the old fuzzy code should
    be replaced by the new array management macros now.
    
    And the type of scsi->count should be changed into "size_t", and
    thus virSCSIDeviceListCount should return size_t instead, similar
    for vir{PCI,USB}DeviceListCount.
    
        
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