net: dsa: sja1105: Add of_node_put() before return

Fix following coccicheck warning:
./drivers/net/dsa/sja1105/sja1105_main.c:1193:1-33: WARNING: Function
for_each_available_child_of_node should have of_node_put() before return.

Early exits from for_each_available_child_of_node should decrement the
node reference counter.

Fixes: 9ca482a ("net: dsa: sja1105: parse {rx, tx}-internal-delay-ps properties for RGMII delays")
Signed-off-by: Wan Jiabing <wanjiabing@vivo.com>
Link: https://lore.kernel.org/r/20211021094606.7118-1-wanjiabing@vivo.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/dsa/sja1105/sja1105_main.c

@@ -1233,8 +1233,10 @@ static int sja1105_parse_ports_node(struct sja1105_private *priv,
 		priv->phy_mode[index] = phy_mode;
 
 		err = sja1105_parse_rgmii_delays(priv, index, child);
-		if (err)
+		if (err) {
+			of_node_put(child);
 			return err;
+		}
 	}
 
 	return 0;