scsi: sym53c8xx_2: Use complete() instead complete_all()

There is only one waiter for the completion, therefore there is no need
to use complete_all(). Let's make that clear by using complete() instead
of complete_all().

The usage pattern of the completion is:

waiter context                          waker context

sym_eh_handler()
  struct completion eh_done
  init_completion(eh_done)
  pci_channel_offline()
  wait_for_completion_timeout(eh_done)

                                        sym2_io_resume()
                                          complete(eh_done)
Signed-off-by: NDaniel Wagner <daniel.wagner@bmw-carit.de>
Reviewed-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/sym53c8xx_2/sym_glue.c

@@ -1874,7 +1874,7 @@ static void sym2_io_resume(struct pci_dev *pdev)
 
 	spin_lock_irq(shost->host_lock);
 	if (sym_data->io_reset)
-		complete_all(sym_data->io_reset);
+		complete(sym_data->io_reset);
 	spin_unlock_irq(shost->host_lock);
 }