Fix typo in perf read error message

kernel/sched/pb.c

@@ -107,7 +107,7 @@ static struct task_struct * pick_next_task_pb(struct rq *rq,
 			u64 read_error = get_perf_counter(pb->pevent, &perf_counter);
 
 			if (read_error){
-				printk(KERN_WARNING "FETCHING PERFORMACE COUNTER IN PB SCHEDULER FAILED WITH %llu\n", read_error);
+				printk(KERN_WARNING "FETCHING PERFORMANCE COUNTER IN PB SCHEDULER FAILED WITH %llu\n", read_error);
 			}
 
 			terminate_perf_event(pb->pevent);