staging: r8188eu: clean up comparsions to false

Clean up comparsions to false.

x == false -> !x

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20210818080854.15847-2-straube.linux@gmail.com


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