bonding: convert bond_debugfs.c to use netdev_printk instead of pr_

One occurance left intact as it's unrelated to net_device.

CC: Jay Vosburgh <j.vosburgh@gmail.com>
CC: Andy Gospodarek <andy@greyhouse.net>
Signed-off-by: Veaceslav Falico <vfalico@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/bonding/bond_debugfs.c

@@ -69,8 +69,7 @@ void bond_debug_register(struct bonding *bond)
 		debugfs_create_dir(bond->dev->name, bonding_debug_root);
 
 	if (!bond->debug_dir) {
-		pr_warn("%s: Warning: failed to register to debugfs\n",
-			bond->dev->name);
+		netdev_warn(bond->dev, "failed to register to debugfs\n");
 		return;
 	}
 
@@ -98,8 +97,7 @@ void bond_debug_reregister(struct bonding *bond)
 	if (d) {
 		bond->debug_dir = d;
 	} else {
-		pr_warn("%s: Warning: failed to reregister, so just unregister old one\n",
-			bond->dev->name);
+		netdev_warn(bond->dev, "failed to reregister, so just unregister old one\n");
 		bond_debug_unregister(bond);
 	}
 }