powerpc: annotate implicit fall throughs

[Michael Ellerman]

On Wed, 2018-11-28 at 22:28:30 UTC, Stephen Rothwell wrote:
> There is a plan to build the kernel with -Wimplicit-fallthrough and these
> places in the code produced warnings, but because we build arch/powerpc
> with -Werror, they became errors.  Fix them up.
> 
> This patch produces no change in behaviour, but should be reviewed in
> case these are actually bugs not intentional fallthoughs.
> 
> Cc: Kees Cook <keescook at google.com>
> Cc: Gustavo A. R. Silva <gustavo at embeddedor.com>
> Cc: Nicholas Piggin <npiggin at gmail.com>
> Cc: Balbir Singh <bsingharora at gmail.com>
> Signed-off-by: Stephen Rothwell <sfr at canb.auug.org.au>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/8ad940217cce2b6ccc8d8cc7156e9a

cheers