wifi: ray_cs: remove one redundant del_timer

In ray_detach, it and its child function ray_release both call
del_timer(_sync) on the same timer.

Fix this by removing the del_timer_sync in the ray_detach, and revising
the del_timer to del_timer_sync.
Signed-off-by: Dongliang Mu <dzm91@hust.edu.cn>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230316133236.556198-2-dzm91@hust.edu.cn

drivers/net/wireless/legacy/ray_cs.c

@@ -328,7 +328,6 @@ static int ray_probe(struct pcmcia_device *p_dev)
 static void ray_detach(struct pcmcia_device *link)
 {
 	struct net_device *dev;
-	ray_dev_t *local;
 
 	dev_dbg(&link->dev, "ray_detach\n");
 
@@ -337,9 +336,6 @@ static void ray_detach(struct pcmcia_device *link)
 
 	ray_release(link);
 
-	local = netdev_priv(dev);
-	del_timer_sync(&local->timer);
-
 	if (link->priv) {
 		unregister_netdev(dev);
 		free_netdev(dev);
@@ -740,7 +736,7 @@ static void ray_release(struct pcmcia_device *link)
 
 	dev_dbg(&link->dev, "ray_release\n");
 
-	del_timer(&local->timer);
+	del_timer_sync(&local->timer);
 
 	iounmap(local->sram);
 	iounmap(local->rmem);