staging: unisys: visorbus: keep the success path on the left side

If you can't find the dev, it is an error. Indent for the error, instead
of the success.

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>