USB: legousbtower: drop superfluous brackets

Drop superfluous brackets around single-line blocks.

Also add missing white space around operators in a for-expression being
modified.

Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20191105084152.16322-14-johan@kernel.org


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