staging: unisys: visorbus: remove POSTCODE from bus_configure

Remove the POSTCODE logging from bus_configure, replace it with an
error message if we fail dumping the errno.

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>