staging: rtl8192u: add empty debug functions

Add two empty functions to handle the case when CONFIG_IEEE80211_DEBUG
is turned off. These two functions will be used by module init() and
and exit().

Signed-off-by: Tong Zhang <ztong0001@gmail.com>
Link: https://lore.kernel.org/r/20220224064033.1530924-2-ztong0001@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>