scsi: smartpqi: Enhance shutdown notification

Provide more detailed information about cache flush errors during shutdown.
Reviewed-by: Mahesh Rajashekhara <mahesh.rajashekhara@microchip.com>
Reviewed-by: Scott Benesh <scott.benesh@microchip.com>
Reviewed-by: Scott Teel <scott.teel@microchip.com>
Reviewed-by: Mike McGowen <mike.mcgowen@microchip.com>
Reviewed-by: Kevin Barnett <kevin.barnett@microchip.com>
Signed-off-by: David Strahan <David.Strahan@microchip.com>
Signed-off-by: Don Brace <don.brace@microchip.com>
Link: https://lore.kernel.org/r/20230824155812.789913-6-don.brace@microchip.comSigned-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/smartpqi/smartpqi_init.c

@@ -9161,7 +9161,7 @@ static void pqi_shutdown(struct pci_dev *pci_dev)
 	rc = pqi_flush_cache(ctrl_info, shutdown_event);
 	if (rc)
 		dev_err(&pci_dev->dev,
-			"unable to flush controller cache\n");
+			"unable to flush controller cache during shutdown\n");
 
 	pqi_crash_if_pending_command(ctrl_info);
 	pqi_reset(ctrl_info);