s390/dasd: remove unneeded code

Fix these set but not used warnings:

drivers/s390/block/dasd.c:3933:6: warning: variable 'rc' set but not used [-Wunused-but-set-variable]
drivers/s390/block/dasd_alias.c:757:6: warning: variable 'rc' set but not used [-Wunused-but-set-variable]

In addition to that remove the test if an unsigned is < 0:

drivers/s390/block/dasd_devmap.c:153:11: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

drivers/s390/block/dasd.c

@@ -3921,7 +3921,6 @@ EXPORT_SYMBOL(dasd_schedule_requeue);
 int dasd_generic_pm_freeze(struct ccw_device *cdev)
 {
 	struct dasd_device *device = dasd_device_from_cdev(cdev);
-	int rc;
 
 	if (IS_ERR(device))
 		return PTR_ERR(device);
@@ -3930,7 +3929,7 @@ int dasd_generic_pm_freeze(struct ccw_device *cdev)
 	set_bit(DASD_FLAG_SUSPENDED, &device->flags);
 
 	if (device->discipline->freeze)
-		rc = device->discipline->freeze(device);
+		device->discipline->freeze(device);
 
 	/* disallow new I/O  */
 	dasd_device_set_stop_bits(device, DASD_STOPPED_PM);

drivers/s390/block/dasd_alias.c

@@ -754,7 +754,6 @@ static void flush_all_alias_devices_on_lcu(struct alias_lcu *lcu)
 	struct alias_pav_group *pavgroup;
 	struct dasd_device *device, *temp;
 	struct dasd_eckd_private *private;
-	int rc;
 	unsigned long flags;
 	LIST_HEAD(active);
 
@@ -785,7 +784,7 @@ static void flush_all_alias_devices_on_lcu(struct alias_lcu *lcu)
 		device = list_first_entry(&active, struct dasd_device,
 					  alias_list);
 		spin_unlock_irqrestore(&lcu->lock, flags);
-		rc = dasd_flush_device_queue(device);
+		dasd_flush_device_queue(device);
 		spin_lock_irqsave(&lcu->lock, flags);
 		/*
 		 * only move device around if it wasn't moved away while we

drivers/s390/block/dasd_devmap.c

@@ -150,7 +150,7 @@ static int __init dasd_busid(char *str, int *id0, int *id1, int *devno)
 	/* Old style 0xXXXX or XXXX */
 	if (!kstrtouint(str, 16, &val)) {
 		*id0 = *id1 = 0;
-		if (val < 0 || val > 0xffff)
+		if (val > 0xffff)
 			return -EINVAL;
 		*devno = val;
 		return 0;