PCI: Simplify pci_dev_driver()

Simplify pci_dev_driver() by removing the "else".  The "if" case always
returns, so the "else" is superfluous.  No functional change intended.

Link: https://lore.kernel.org/r/20230824193712.542167-9-helgaas@kernel.org


Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>