scsi: nsp32: Do not set message byte

The message byte always devolves to COMMAND_COMPLETE, so there is no point
in setting it.

Link: https://lore.kernel.org/r/20210427083046.31620-25-hare@suse.de


Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>