powernv/npu-dma.c: Remove spurious WARN_ON when a PCI device has no of_node

[Michael Ellerman]

On Wed, 2017-06-14 at 04:47:50 UTC, Alistair Popple wrote:
> "4c3b89e powerpc/powernv: Add sanity checks to pnv_pci_get_{gpu|npu}_dev"
> introduced explicit warnings in pnv_pci_get_npu_dev() when a PCIe device
> has no associated device-tree node. However not all PCIe devices have an
> of_node and pnv_pci_get_npu_dev() gets indirectly called at least once for
> every PCIe device in the system. This results in spurious WARN_ON()'s so
> remove it.
> 
> The same situation should not exist for pnv_pci_get_gpu_dev() as any NPU
> based PCIe device requires a device-tree node.
> 
> Signed-off-by: Alistair Popple <alistair at popple.id.au>
> Reported-by: Alexey Kardashevskiy <aik at ozlabs.ru>

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/377aa6b0efbaa29cfeecd8b9244641

cheers