greybus: interface: disable interface on registration failures

Disable and deactivate an interface immediately on registration
failures.

Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/svc.c

@@ -518,7 +518,12 @@ static void gb_svc_process_intf_hotplug(struct gb_operation *operation)
 		goto err_interface_deactivate;
 	}
 
-	gb_interface_add(intf);
+	ret = gb_interface_add(intf);
+	if (ret) {
+		gb_interface_disable(intf);
+		gb_interface_deactivate(intf);
+		return;
+	}
 
 	return;