staging: rtl8723au: Remove duplicated argument to ||

This patch removes duplicated argument to ||, fixing the
following warning detected using coccinelle tool:
duplicated argument to && or ||.

Signed-off-by: Roberta Dobrescu <roberta.dobrescu@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>