PCI: Fix pci_register_host_bridge() device_register() error handling

PCI: Fix pci_register_host_bridge() device_register() error handling

If device_register() has an error, we should bail out of
pci_register_host_bridge() rather than continuing on.

Fixes: 2b86b9dd0f6d ("PCI: Add pci_register_host_bridge() interface")
Link: https://lore.kernel.org/r/20200513223859.11295-1-robh@kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>