staging: rtl8188eu: cleanup remaining comparsions to true

Cleanup remaining comparsions to true.
if (x == true) -> if (x)
if (x != true) -> if (!x)
if (!x == true) -> if (!x)

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>