scsi: sd: Free scsi_disk device via put_device()

After a device is initialized via device_initialize() it should be freed
via put_device(). sd_probe() currently gets this wrong, fix it up.

Link: https://lore.kernel.org/r/20210906090112.531442-1-ming.lei@redhat.com
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>