[PATCH net RESEND] PCI: fix oops when try to find Root Port for a PCI device

[David Miller]

From: Bjorn Helgaas <helgaas at kernel.org>
Date: Wed, 16 Aug 2017 15:02:37 -0500

> Your fix looks right to me.

Someone please submit this fix formally because this change is now in
Linus's tree.

Thank you.