pkt_sched: ERR_PTR() ususally encodes an negative errno, not positive.

Note, in the following patch, 'err' is initialized as:

int err = -ENOBUFS;
Signed-off-by: WANG Cong <wcong@critical-links.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sched/sch_generic.c

@@ -468,7 +468,7 @@ struct Qdisc *qdisc_alloc(struct net_device *dev, struct Qdisc_ops *ops)
 
 	return sch;
 errout:
-	return ERR_PTR(-err);
+	return ERR_PTR(err);
 }
 
 struct Qdisc * qdisc_create_dflt(struct net_device *dev, struct Qdisc_ops *ops,