Merge branch 'remotes/lorenzo/pci/aardvark'

- Indicate error in 'val' when config read fails (Pali Rohár)

- Don't touch PCIe registers if no card connected (Pali Rohár)

* remotes/lorenzo/pci/aardvark:
  PCI: aardvark: Don't touch PCIe registers if no card connected
  PCI: aardvark: Indicate error in 'val' when config read fails