swanctl: Clear config from memory

The 'secrets' section in the config file may contain passwords/PINs.

src/swanctl/commands/load_all.c

@@ -86,7 +86,7 @@ static int load_all(vici_conn_t *conn)
 		ret = load_conns_cfg(conn, format, cfg);
 	}
 
-	cfg->destroy(cfg);
+	cfg->destroy_clear(cfg);
 
 	return ret;
 }

src/swanctl/commands/load_authorities.c

@@ -345,7 +345,7 @@ static int load_authorities(vici_conn_t *conn)
 
 	ret = load_authorities_cfg(conn, format, cfg);
 
-	cfg->destroy(cfg);
+	cfg->destroy_clear(cfg);
 
 	return ret;
 }

src/swanctl/commands/load_conns.c

@@ -462,7 +462,7 @@ static int load_conns(vici_conn_t *conn)
 
 	ret = load_conns_cfg(conn, format, cfg);
 
-	cfg->destroy(cfg);
+	cfg->destroy_clear(cfg);
 
 	return ret;
 }

src/swanctl/commands/load_creds.c

@@ -990,7 +990,7 @@ static int load_creds(vici_conn_t *conn)
 
 	ret = load_creds_cfg(conn, format, cfg, clear, noprompt);
 
-	cfg->destroy(cfg);
+	cfg->destroy_clear(cfg);
 
 	return ret;
 }

src/swanctl/commands/load_pools.c

@@ -285,7 +285,7 @@ static int load_pools(vici_conn_t *conn)
 
 	ret = load_pools_cfg(conn, format, cfg);
 
-	cfg->destroy(cfg);
+	cfg->destroy_clear(cfg);
 
 	return ret;
 }