powerpc: Add missing error check to prom_find_boot_cpu()

[Darren Stevens]

Hello Michael

On 27/01/2017, Michael Ellerman wrote:
> On Mon, 2017-01-23 at 19:42:54 UTC, Darren Stevens wrote:
> Applied to powerpc fixes, thanks.
>
> https://git.kernel.org/powerpc/c/af2b7fa17eb92e52b65f96604448ff

Thanks, I was going to ask about backporting to 4.9 as it's a LTS now, but I
see from the above you've beaten me to it! Much appreciated.

I'm nearing the point where I will want to add the Nemo setup code to the
kernel, and I see 2 choices: 

Continue as we do, with #ifdefs in the setup.c / pci.c files.

Create 2 new files setup-nemo.c and pci-nemo.c - I am assuming this would be
the prefered option?

Regards
Darren