[PATCH] bonding: fix ->get_settings error checking

Since get_settings() returns a signed int and it gets checked
for < 0 to catch an error, res should be a signed int too.
Signed-off-by: NEric Sesterhenn <snakebyte@gmx.de>
Signed-off-by: NAlexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

drivers/net/bonding/bond_main.c

@@ -576,7 +576,7 @@ static int bond_update_speed_duplex(struct slave *slave)
 	slave->duplex = DUPLEX_FULL;
 
 	if (slave_dev->ethtool_ops) {
-		u32 res;
+		int res;
 
 		if (!slave_dev->ethtool_ops->get_settings) {
 			return -1;