[PATCH] Add fallthrough comment to kvprintf()

[Mark Johnston]

On Tue, Jul 17, 2018 at 02:12:32PM +0200, Sebastian Huber wrote:
> STYLE(9) recommends a FALLTHROUGH comment.  Coverity Scan also
> complained about this area.
> ---
>  sys/kern/subr_prf.c | 1 +
>  1 file changed, 1 insertion(+)

Committed in r336417, thanks.