staging: speakup: fix redundant return in void functions

Signed-off-by: Domagoj Trsan <domagoj.trsan@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --cc drivers/staging/speakup/buffers.c
Simple merge

diff --cc drivers/staging/speakup/main.c
Simple merge

diff --cc drivers/staging/speakup/varhandlers.c
Simple merge