orinoco: remove useless variable 'err' in spectrum_cs_suspend()

Fix the following coccicheck warning:

drivers/net/wireless/intersil/orinoco/spectrum_cs.c:281:5-8: Unneeded
variable: "err". Return "0" on line 286
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200413082043.22468-1-yanaijie@huawei.com

drivers/net/wireless/intersil/orinoco/spectrum_cs.c

@@ -278,12 +278,11 @@ static int
 spectrum_cs_suspend(struct pcmcia_device *link)
 {
 	struct orinoco_private *priv = link->priv;
-	int err = 0;
 
 	/* Mark the device as stopped, to block IO until later */
 	orinoco_down(priv);
 
-	return err;
+	return 0;
 }
 
 static int