staging: unisys: visorbus: rename create_visor_device gotos

Away is ambiguous when specifying error vs success. Make return labels
more meaningful by marking them as error paths.

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