scsi: virtio_scsi: Remove code that zeroes driver-private command data
Since the SCSI core zeroes driver-private command data, remove
that code from the virtio driver.
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com> Reviewed-by: Hannes Reinecke <hare@suse.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: Michael S. Tsirkin <mst@redhat.com> Cc: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>