[PATCH] Revert [NET_SCHED]: HTB: fix incorrect use of RB_EMPTY_NODE

[Ismail Donmez <ismail@pardus.org.tr>]

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With commit 10fd48f2376db52f08bf0420d2c4f580e39269e1 [1] ,  RB_EMPTY_NODE 
changed behaviour so it returns true when the node is empty as expected. 
Hence Patrick McHardy's fix for sched_htb.c should be reverted.

Signed-off-by: Ismail Donmez <ismail@pardus.org.tr>

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diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index 6c058e3..1f1360e 100644
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c
@@ -391,7 +391,7 @@ static inline void htb_add_class_to_row(
 /* If this triggers, it is a bug in this code, but it need not be fatal */
 static void htb_safe_rb_erase(struct rb_node *rb, struct rb_root *root)
 {
-	if (!RB_EMPTY_NODE(rb)) {
+	if (RB_EMPTY_NODE(rb)) {
 		WARN_ON(1);
 	} else {
 		rb_erase(rb, root);