powerpc/xive: Properly use static keyword for inline function

[Michael Ellerman]

On Tue, 2017-12-26 at 13:00:17 UTC, Mathieu Malaterre wrote:
> Fix fatal warning during compilation:
> 
> In file included from arch/powerpc/xmon/xmon.c:54:0:
> ./arch/powerpc/include/asm/xive.h:157:20: error: no previous prototype for ‘xive_smp_prepare_cpu’ [-Werror=missing-prototypes]
>  extern inline int  xive_smp_prepare_cpu(unsigned int cpu) { return -EINVAL; }
>                     ^
> 
> Signed-off-by: Mathieu Malaterre <malat at debian.org>
> Reviewed-by: Cédric Le Goater <clg at kaod.org>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/38833faa112c10dd6e3d888f8b53de

cheers