ax25: merge repeat codes in ax25_dev_device_down()

Merge repeat codes to reduce the duplication.
Signed-off-by: Lu Wei <luwei32@huawei.com>
Link: https://lore.kernel.org/r/20220516062804.254742-1-luwei32@huawei.comSigned-off-by: Paolo Abeni <pabeni@redhat.com>

net/ax25/ax25_dev.c

@@ -115,29 +115,27 @@ void ax25_dev_device_down(struct net_device *dev)
 
 	if ((s = ax25_dev_list) == ax25_dev) {
 		ax25_dev_list = s->next;
-		spin_unlock_bh(&ax25_dev_lock);
-		ax25_dev_put(ax25_dev);
-		dev->ax25_ptr = NULL;
-		dev_put_track(dev, &ax25_dev->dev_tracker);
-		ax25_dev_put(ax25_dev);
-		return;
+		goto unlock_put;
 	}
 
 	while (s != NULL && s->next != NULL) {
 		if (s->next == ax25_dev) {
 			s->next = ax25_dev->next;
+			goto unlock_put;
+		}
+
+		s = s->next;
+	}
 	spin_unlock_bh(&ax25_dev_lock);
-			ax25_dev_put(ax25_dev);
 	dev->ax25_ptr = NULL;
-			dev_put_track(dev, &ax25_dev->dev_tracker);
 	ax25_dev_put(ax25_dev);
 	return;
-		}
 
-		s = s->next;
-	}
+unlock_put:
 	spin_unlock_bh(&ax25_dev_lock);
+	ax25_dev_put(ax25_dev);
 	dev->ax25_ptr = NULL;
+	dev_put_track(dev, &ax25_dev->dev_tracker);
 	ax25_dev_put(ax25_dev);
 }