staging: media: lirc: Fixes missing blank line warning.

Fixes "Missing a blank line after declarations" checkpatch.pl warning in
lirc_serial.c

Signed-off-by: Gulsah Kose <gulsah.1004@gmail.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org&gt;.>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>