hpsa: fix handling of hpsa_volume_offline return value

Make return value an int instead of an unsigned char so that
we do not lose negative error return values.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Reviewed-by: Webb Scales <webb.scales@hp.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index af51e7d..31184b3 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -2543,11 +2543,11 @@
 /* Determine offline status of a volume.
  * Return either:
  *  0 (not offline)
- * -1 (offline for unknown reasons)
+ *  0xff (offline for unknown reasons)
  *  # (integer code indicating one of several NOT READY states
  *     describing why a volume is to be kept offline)
  */
-static unsigned char hpsa_volume_offline(struct ctlr_info *h,
+static int hpsa_volume_offline(struct ctlr_info *h,
 					unsigned char scsi3addr[])
 {
 	struct CommandList *c;
@@ -2646,11 +2646,15 @@
 
 	if (this_device->devtype == TYPE_DISK &&
 		is_logical_dev_addr_mode(scsi3addr)) {
+		int volume_offline;
+
 		hpsa_get_raid_level(h, scsi3addr, &this_device->raid_level);
 		if (h->fw_support & MISC_FW_RAID_OFFLOAD_BASIC)
 			hpsa_get_ioaccel_status(h, scsi3addr, this_device);
-		this_device->volume_offline =
-			hpsa_volume_offline(h, scsi3addr);
+		volume_offline = hpsa_volume_offline(h, scsi3addr);
+		if (volume_offline < 0 || volume_offline > 0xff)
+			volume_offline = HPSA_VPD_LV_STATUS_UNSUPPORTED;
+		this_device->volume_offline = volume_offline & 0xff;
 	} else {
 		this_device->raid_level = RAID_UNKNOWN;
 		this_device->offload_config = 0;