powerpc/8xx: fix cpm_cascade() dual end of interrupt

[Michael Ellerman]

On Tue, 2018-02-27 at 11:25:55 UTC, Christophe Leroy wrote:
> cpm_cascade() doesn't have to call eoi() as it is already called
> by handle_fasteoi_irq()
> 
> And cpm_get_irq() will always return an unsigned int so the test
> is useless
> 
> Signed-off-by: Christophe Leroy <christophe.leroy at c-s.fr>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/c554ac91ce2213faa91c51c4542377

cheers