staging: unisys: visorbus: simplify debugfs print statment

Simplify debugfs statement so it is clearer and more compact.

Signed-off-by: David Kershner <david.kershner@unisys.com>
Reviewed-by: Tim Sell <timothy.sell@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>