check unsigned < 0 in

hi,

since get_settings() returns a signed int and it gets checked for < 0 to catch an error, res should be a signed int too.

I saw there are quite some modifications to this file in -mm what is the way to deal with this? Should one create a patch agains -mm instead of the latest git in such a case?

@@ -1032,7 +1032,7 @@ static int bond_update_speed_duplex(stru
 	slave->duplex = DUPLEX_FULL;
 
 	if (slave_dev->ethtool_ops) {
-		u32 res;
+		int res;
 
 		if (!slave_dev->ethtool_ops->get_settings) {
 			return -1;

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