fix removal of unknown device

Netifd will crash if an attempt is made to remove a device that is not
known to netifd.  For instance:

  ubus call network.interface.lan remove_device "{ \"name\": \"xxx\" }"

Signed-off-by: Nathan Hintz <nlhintz@hotmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/ubus.c b/ubus.c
index d6d4188..2b92c78 100644
--- a/ubus.c
+++ b/ubus.c
@@ -592,7 +592,7 @@ netifd_iface_handle_device(struct ubus_context *ctx, struct ubus_object *obj,
 	device_lock();
 
 	dev = device_get(blobmsg_data(tb[DEV_NAME]), add ? 2 : 0);
-	if (add && !dev) {
+	if (!dev) {
 		ret = UBUS_STATUS_NOT_FOUND;
 		goto out;
 	}