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pci_register_io_range() has only one definition, so there is no need for
the __weak attribute.  Remove it.
Tested-by: dann frazier <dann.frazier@canonical.com>
Signed-off-by: Gabriele Paoloni <gabriele.paoloni@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>