rtl8188eu: Fix a typo in rtw_led.*

A rather obvious typo in one of the identifier has been found.  This patch
fixes the typo and ensures any lines changed do not exceed 80 characters
as indicated by scripts/checkpatch.pl

Signed-off-by: Krzysztof Konopko <kris@konagma.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>