scsi: smartpqi: correct REGNEWD return status

Return -EINPROGRESS when a rescan worker is queued.
Reviewed-by: Scott Benesh <scott.benesh@microsemi.com>
Reviewed-by: Kevin Barnett <kevin.barnett@microsemi.com>
Signed-off-by: Murthy Bhat <Murthy.Bhat@microsemi.com>
Signed-off-by: Don Brace <don.brace@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/smartpqi/smartpqi_init.c

@@ -2243,7 +2243,7 @@ static int pqi_scan_scsi_devices(struct pqi_ctrl_info *ctrl_info)
 
 	if (!mutex_trylock(&ctrl_info->scan_mutex)) {
 		pqi_schedule_rescan_worker_delayed(ctrl_info);
-
+		rc = -EINPROGRESS;
 	} else {
 		rc = pqi_update_scsi_devices(ctrl_info);
 		if (rc)