If device_add() fails then it should return the error code but instead
the current code returns success.

Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index ebf35cb6..75a0b55 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -3019,7 +3019,8 @@ static int sd_probe(struct device *dev)
        sdkp->dev.class = &sd_disk_class;
        dev_set_name(&sdkp->dev, "%s", dev_name(dev));
 
-       if (device_add(&sdkp->dev))
+       error = device_add(&sdkp->dev);
+       if (error)
                goto out_free_index;
 
        get_device(dev);
--
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