be2iscsi : Fix kernel panic during reboot/shutdown

In the reboot/shutdown path, workqueue was destroyed after the
adapter resource were freed. The task associated with workqueue
was getting executed after resources were freed. This lead to
kernel panic.

Signed-off-by: John Soni Jose <[e-mail]>
Signed-off-by: Jayamohan Kallickal <[e-mail]>
Signed-off-by: Christoph Hellwig <[e-mail]>

drivers/scsi/be2iscsi/be_main.c

···
 			free_irq(phba->pcidev->irq, phba);
 		}
 	pci_disable_msix(phba->pcidev);
+	cancel_delayed_work_sync(&phba->beiscsi_hw_check_task);
 
 	for (i = 0; i < phba->num_cpus; i++) {
 		pbe_eq = &phwi_context->be_eq[i];
···
 		hwi_cleanup(phba);
 	}
 
-	cancel_delayed_work_sync(&phba->beiscsi_hw_check_task);
 }
 
 static void beiscsi_remove(struct pci_dev *pcidev)