Coverity CID 714665: vfio_ext_cap_len() use of uninitialized variable

[Bjorn Helgaas <bhelgaas@xxxxxxxxxx>]

Coverity complains that "byte" is used uninitialized in
drivers/vfio/pci/vfio_pci_config.c in vfio_ext_cap_len():

1139                        sts = byte & PCI_TPH_CAP_ST_MASK;
1140                        sts >>= PCI_TPH_CAP_ST_SHIFT;
1141                        return PCI_TPH_BASE_SIZEOF + round_up(sts * 2, 4);

This is CID 714665.
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