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>

Author: Bart Van Assche

drivers/scsi/virtio_scsi.c

@@ -547,7 +547,6 @@ static int virtscsi_queuecommand(struct virtio_scsi *vscsi,
 	dev_dbg(&sc->device->sdev_gendev,
 		"cmd %p CDB: %#02x\n", sc, sc->cmnd[0]);
 
-	memset(cmd, 0, sizeof(*cmd));
 	cmd->sc = sc;
 
 	BUG_ON(sc->cmd_len > VIRTIO_SCSI_CDB_SIZE);