[PATCH] powerpc/signal: Move and simplify get_clean_sp()

[Christoph Hellwig]

On Thu, Aug 06, 2020 at 08:50:20AM +0000, Christophe Leroy wrote:
> get_clean_sp() is only used in kernel/signal.c . Move it there.
> 
> And GCC is smart enough to reduce the function when on PPC32, no
> need of a special PPC32 simple version.

What about just open coding it in the only caller, which would seem even
cleaner?