xpp: mark an AB as failed if it gives bad desc

If we fail at handling the device descriptor from the Astribank, mark it
as in state "failed".

Signed-off-by: Tzafrir Cohen <tzafrir.cohen@xorcom.com>

drivers/dahdi/xpp/card_global.c

@@ -568,6 +568,7 @@ HANDLER_DEF(GLOBAL, AB_DESCRIPTION)
 	}
 	goto out;
 proto_err:
+	xbus_setstate(xbus, XBUS_STATE_FAIL);
 	dump_packet("AB_DESCRIPTION", pack, DBG_ANY);
 out:
 	return ret;