[SCSI] fix two leaks in scsi_alloc_sdev failure paths

If the scsi_alloc_queue or the slave_alloc calls in scsi_alloc_device fail,
we forget to release the locally allocated sdev on the failure path.

Coverity #609
Signed-off-by: NDave Jones <davej@redhat.com>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/scsi_scan.c

@@ -251,6 +251,7 @@ static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget,
 		/* release fn is set up in scsi_sysfs_device_initialise, so
 		 * have to free and put manually here */
 		put_device(&starget->dev);
+		kfree(sdev);
 		goto out;
 	}