PCI: designware: Use typical "for" loop idiom
It's conventional to use "for" rather than "while" for simple iteration.
No functional change.
Signed-off-by: 
Bjorn Helgaas <bhelgaas@google.com>
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It's conventional to use "for" rather than "while" for simple iteration.
No functional change.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>