net: dsa: remove NULL check for priv and platform data

Because the uclass has the "*_auto" properties set, the driver model
will take care of allocating the private structures for us and they
can't be NULL. Drop the checks.

Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>

net/dsa-uclass.c

@@ -28,8 +28,8 @@ int dsa_set_tagging(struct udevice *dev, ushort headroom, ushort tailroom)
 {
 	struct dsa_priv *priv;
 
-	if (!dev || !dev_get_uclass_priv(dev))
-		return -ENODEV;
+	if (!dev)
+		return -EINVAL;
 
 	if (headroom + tailroom > DSA_MAX_OVR)
 		return -EINVAL;
@@ -47,11 +47,13 @@ int dsa_set_tagging(struct udevice *dev, ushort headroom, ushort tailroom)
 /* returns the DSA master Ethernet device */
 struct udevice *dsa_get_master(struct udevice *dev)
 {
-	struct dsa_priv *priv = dev_get_uclass_priv(dev);
+	struct dsa_priv *priv;
 
-	if (!priv)
+	if (!dev)
 		return NULL;
 
+	priv = dev_get_uclass_priv(dev);
+
 	return priv->master_dev;
 }
 
@@ -67,9 +69,6 @@ static int dsa_port_start(struct udevice *pdev)
 	struct dsa_ops *ops = dsa_get_ops(dev);
 	int err;
 
-	if (!priv)
-		return -ENODEV;
-
 	if (!master) {
 		dev_err(pdev, "DSA master Ethernet device not found!\n");
 		return -EINVAL;
@@ -101,9 +100,6 @@ static void dsa_port_stop(struct udevice *pdev)
 	struct udevice *master = dsa_get_master(dev);
 	struct dsa_ops *ops = dsa_get_ops(dev);
 
-	if (!priv)
-		return;
-
 	if (ops->port_disable) {
 		struct dsa_port_pdata *port_pdata;
 
@@ -347,7 +343,7 @@ static int dsa_post_bind(struct udevice *dev)
 	ofnode node = dev_ofnode(dev), pnode;
 	int i, err, first_err = 0;
 
-	if (!pdata || !ofnode_valid(node))
+	if (!ofnode_valid(node))
 		return -ENODEV;
 
 	pdata->master_node = ofnode_null();
@@ -459,9 +455,6 @@ static int dsa_pre_probe(struct udevice *dev)
 	struct dsa_pdata *pdata = dev_get_uclass_plat(dev);
 	struct dsa_priv *priv = dev_get_uclass_priv(dev);
 
-	if (!pdata || !priv)
-		return -ENODEV;
-
 	priv->num_ports = pdata->num_ports;
 	priv->cpu_port = pdata->cpu_port;
 	priv->cpu_port_fixed_phy = fixed_phy_create(pdata->cpu_port_node);