Since WMM support was never actually implemented and related TODO is
more than 13 years old, it might be reasonable to remove all of the
WMM stubs from rtl8192cu and simplify related code. Minor comment
style adjustments suggested by checkpatch.pl, compile tested only.

Found by Linux Verification Center (linuxtesting.org) with SVACE.
Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://msgid.link/20240320084324.109506-1-dmantipov@yandex.ru