s390: remove unneeded variables

This patch remove unneeded variables used to store return values.

These issues were detected with the Coccinelle script:
scripts/coccinelle/misc/returnvar.cocci

[[e-mail]]: make qeth_l[2/3]_stop() return void

Signed-off-by: Peter Senna Tschudin <[e-mail]>
Signed-off-by: Heiko Carstens <[e-mail]>
Signed-off-by: Martin Schwidefsky <[e-mail]>

drivers/s390/cio/eadm_sch.c

···
 {
 	struct eadm_private *private;
 	unsigned long flags;
-	int ret = 0;
 
 	spin_lock_irqsave(sch->lock, flags);
 	if (!device_is_registered(&sch->dev))
···
 out_unlock:
 	spin_unlock_irqrestore(sch->lock, flags);
 
-	return ret;
+	return 0;
 }
 
 static struct css_device_id eadm_subchannel_ids[] = {

drivers/s390/net/qeth_l2_main.c

···
 	return rc;
 }
 
-static int qeth_l2_stop_card(struct qeth_card *card, int recovery_mode)
+static void qeth_l2_stop_card(struct qeth_card *card, int recovery_mode)
 {
-	int rc = 0;
-
 	QETH_DBF_TEXT(SETUP , 2, "stopcard");
 	QETH_DBF_HEX(SETUP, 2, &card, sizeof(void *));
 
···
 		qeth_clear_cmd_buffers(&card->read);
 		qeth_clear_cmd_buffers(&card->write);
 	}
-	return rc;
 }
 
 static int qeth_l2_process_inbound_buffer(struct qeth_card *card,

drivers/s390/net/qeth_l3_main.c

···
 	return card ;
 }
 
-static int qeth_l3_stop_card(struct qeth_card *card, int recovery_mode)
+static void qeth_l3_stop_card(struct qeth_card *card, int recovery_mode)
 {
-	int rc = 0;
-
 	QETH_DBF_TEXT(SETUP, 2, "stopcard");
 	QETH_DBF_HEX(SETUP, 2, &card, sizeof(void *));
 
···
 		qeth_clear_cmd_buffers(&card->read);
 		qeth_clear_cmd_buffers(&card->write);
 	}
-	return rc;
 }
 
 /*