network: add arg to config clear method

src/lxc/confile.h

@@ -34,7 +34,7 @@ struct lxc_list;
 typedef int (*config_set_cb)(const char *, const char *, struct lxc_conf *,
 			     void *data);
 typedef int (*config_get_cb)(const char *, char *, int, struct lxc_conf *);
-typedef int (*config_clr_cb)(const char *key, struct lxc_conf *c);
+typedef int (*config_clr_cb)(const char *, struct lxc_conf *c, void *data);
 struct lxc_config_t {
 	char *name;
 	config_set_cb set;

src/lxc/lxccontainer.c

@@ -1722,7 +1722,7 @@ static bool do_lxcapi_clear_config_item(struct lxc_container *c,
 	 * implemented.
 	 */
 	if (config && config->clr)
-		ret = config->clr(key, c->lxc_conf);
+		ret = config->clr(key, c->lxc_conf, NULL);
 	if (!ret)
 		do_clear_unexp_config_line(c->lxc_conf, key);