USB: hcd-pci: Use PCI_STD_NUM_BARS when checking standard BARs

USB: hcd-pci: Use PCI_STD_NUM_BARS when checking standard BARs

usb_hcd_pci_probe() searches for an I/O BAR using a combination of
PCI_STD_NUM_BARS (to control loop iteration) and PCI_ROM_RESOURCE (to check
whether the loop exits without finding anything).

Use PCI_STD_NUM_BARS consistently.

No functional change since PCI_STD_NUM_BARS == PCI_ROM_RESOURCE, but this
removes a dependency on that relationship and makes the code read better.

Fixes: c9c13ba428ef ("PCI: Add PCI_STD_NUM_BARS for the number of standard BARs")
Cc: Denis Efremov <efremov@linux.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://lore.kernel.org/r/20220121183330.1141702-1-helgaas@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>