pegasus: Handle disconnect error code correctly.

EPERM means that disconnect() is runnung. It should be treated like
ENODEV

Signed-off-by: Oliver Neukum <oliver@neukum.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/usb/pegasus.c b/drivers/net/usb/pegasus.c
index a8228d8..2138535 100644
--- a/drivers/net/usb/pegasus.c
+++ b/drivers/net/usb/pegasus.c
@@ -899,6 +899,7 @@
 			/* cleanup should already have been scheduled */
 			break;
 		case -ENODEV:		/* disconnect() upcoming */
+		case -EPERM:
 			netif_device_detach(pegasus->net);
 			break;
 		default: