staging: unisys: visorbus: remove postcodes in setup_crash_devices_work_queue

Replace postcodes with dev_err in the function
setup_crash_device_work_queue.

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>