libata: use setup_deferrable_timer

Use setup_deferrable_timer() instead of init_timer_deferrable() to
simplify the code.
Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

drivers/ata/libata-core.c

@@ -5902,9 +5902,9 @@ struct ata_port *ata_port_alloc(struct ata_host *host)
 	INIT_LIST_HEAD(&ap->eh_done_q);
 	init_waitqueue_head(&ap->eh_wait_q);
 	init_completion(&ap->park_req_pending);
-	init_timer_deferrable(&ap->fastdrain_timer);
-	ap->fastdrain_timer.function = ata_eh_fastdrain_timerfn;
-	ap->fastdrain_timer.data = (unsigned long)ap;
+	setup_deferrable_timer(&ap->fastdrain_timer,
+			       ata_eh_fastdrain_timerfn,
+			       (unsigned long)ap);
 
 	ap->cbl = ATA_CBL_NONE;