staging: speakup: Fix warning reported by checkpatch

This patch fixes the checkpatch.pl warnings:
WARNING: Block comments use a trailing */ on a separate line
WARNING: Block comments use * on subsequent lines

Signed-off-by: Aleksey Fedotov <lexa@cfotr.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>