scsi: fix memory leak of sdpk on when gd fails to allocate

On an allocation failure of gd, the current exit path is via
out_free_devt which leaves sdpk still allocated and hence it gets
leaked. Fix this by correcting the order of resource free'ing with a
change in the error exit path labels.

Detected by CoverityScan, CID#1399519 ("Resource Leak")

Fixes: 0dba1314 ("scsi, block: fix duplicate bdi name registration crashes")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Bart Van Assche <Bart.VanAssche@sandisk.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/sd.c

@@ -3213,10 +3213,10 @@ static int sd_probe(struct device *dev)
 	sd_devt = NULL;
  out_put:
 	put_disk(gd);
- out_free:
-	kfree(sdkp);
  out_free_devt:
 	kfree(sd_devt);
+ out_free:
+	kfree(sdkp);
  out:
 	scsi_autopm_put_device(sdp);
 	return error;