tc: propogate errors from tcf_hash_create

Allow tcf_hash_create to return different errors on estimator failure.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sched/act_gact.c b/net/sched/act_gact.c
index ac04289..e7f796a 100644
--- a/net/sched/act_gact.c
+++ b/net/sched/act_gact.c
@@ -88,8 +88,8 @@
 	if (!pc) {
 		pc = tcf_hash_create(parm->index, est, a, sizeof(*gact),
 				     bind, &gact_idx_gen, &gact_hash_info);
-		if (unlikely(!pc))
-			return -ENOMEM;
+		if (IS_ERR(pc))
+		    return PTR_ERR(pc);
 		ret = ACT_P_CREATED;
 	} else {
 		if (!ovr) {