net: mdio-mux: Remove unnecessary 'out of memory' message

This patch fix checkpatch warning about unnecessary 'out of memory'
message.

Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/mdio-mux.c

@@ -145,9 +145,6 @@ int mdio_mux_init(struct device *dev,
 
 		cb = devm_kzalloc(dev, sizeof(*cb), GFP_KERNEL);
 		if (!cb) {
-			dev_err(dev,
-				"Error: Failed to allocate memory for child %pOF\n",
-				child_bus_node);
 			ret_val = -ENOMEM;
 			continue;
 		}
@@ -156,9 +153,6 @@ int mdio_mux_init(struct device *dev,
 
 		cb->mii_bus = mdiobus_alloc();
 		if (!cb->mii_bus) {
-			dev_err(dev,
-				"Error: Failed to allocate MDIO bus for child %pOF\n",
-				child_bus_node);
 			ret_val = -ENOMEM;
 			devm_kfree(dev, cb);
 			continue;