perf sched replay: Use struct task_desc instead of struct task_task for correct meaning

There is no struct task_task at all, thus it is a typo error in the old
commits, now fix it to what it should be in order to avoid unnecessary
misunderstanding.
Signed-off-by: Yunlong Song <yunlong.song@huawei.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1427809596-29559-2-git-send-email-yunlong.song@huawei.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-sched.c

@@ -346,7 +346,7 @@ static struct task_desc *register_pid(struct perf_sched *sched,
 
 	sched->pid_to_task[pid] = task;
 	sched->nr_tasks++;
-	sched->tasks = realloc(sched->tasks, sched->nr_tasks * sizeof(struct task_task *));
+	sched->tasks = realloc(sched->tasks, sched->nr_tasks * sizeof(struct task_desc *));
 	BUG_ON(!sched->tasks);
 	sched->tasks[task->nr] = task;