tcmu: return on first Opt parse failure

We only were returing failure if the last opt to be parsed failed.
This has a return failure when we first detect a failure.
Signed-off-by: Mike Christie <mchristi@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

drivers/target/target_core_user.c

@@ -1118,6 +1118,9 @@ static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev,
 		default:
 			break;
 		}
+
+		if (ret)
+			break;
 	}
 
 	kfree(orig);