ethtool: rename local variable max -> curr

ethtool_set_channels() validates the config against driver's max
settings. It retrieves the current config and stores it in a
variable called max. This was okay when only max settings were
accessed but we will soon want to access current settings as
well, so calling the entire structure max makes the code less
readable.

While at it drop unnecessary parenthesis.

Signed-off-by: Jakub Kicinski <[e-mail]>
Reviewed-by: Quentin Monnet <[e-mail]>
Signed-off-by: Daniel Borkmann <[e-mail]>

net/core/ethtool.c

···
 static noinline_for_stack int ethtool_set_channels(struct net_device *dev,
 						   void __user *useraddr)
 {
-	struct ethtool_channels channels, max = { .cmd = ETHTOOL_GCHANNELS };
+	struct ethtool_channels channels, curr = { .cmd = ETHTOOL_GCHANNELS };
 	u32 max_rx_in_use = 0;
 
 	if (!dev->ethtool_ops->set_channels || !dev->ethtool_ops->get_channels)
···
 	if (copy_from_user(&channels, useraddr, sizeof(channels)))
 		return -EFAULT;
 
-	dev->ethtool_ops->get_channels(dev, &max);
+	dev->ethtool_ops->get_channels(dev, &curr);
 
 	/* ensure new counts are within the maximums */
-	if ((channels.rx_count > max.max_rx) ||
-	    (channels.tx_count > max.max_tx) ||
-	    (channels.combined_count > max.max_combined) ||
-	    (channels.other_count > max.max_other))
+	if (channels.rx_count > curr.max_rx ||
+	    channels.tx_count > curr.max_tx ||
+	    channels.combined_count > curr.max_combined ||
+	    channels.other_count > curr.max_other)
 		return -EINVAL;
 
 	/* ensure the new Rx count fits within the configured Rx flow