staging: media: lirc: remove unnecessary break after return

This patch fixes checkpatch.pl warning in lirc_serial.c file
WARNING : break is not useful after goto or return

Signed-off-by: Tapasweni Pathak <tapaswenipathak@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>