net, sch: fix the typo in register_qdisc()

Signed-off-by: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sched/sch_api.c

@@ -135,7 +135,7 @@ static DEFINE_RWLOCK(qdisc_mod_lock);
 
 static struct Qdisc_ops *qdisc_base;
 
-/* Register/uregister queueing discipline */
+/* Register/unregister queueing discipline */
 
 int register_qdisc(struct Qdisc_ops *qops)
 {