USB: legousbtower: drop redundant open_count check

Drop redundant open_count check in release; the open count is used as a
flag and is only set to 0 or 1.

Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20191105084152.16322-5-johan@kernel.org


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