conf: move ringbuffer members to anonymous struct

src/lxc/conf.h

@@ -174,7 +174,7 @@ struct lxc_console {
 	char name[MAXPATHLEN];
 	struct termios *tios;
 	struct lxc_tty_state *tty_state;
-
+	struct /* lxc_console_ringbuf */ {
 		/* size of the ringbuffer */
 		uint64_t buffer_size;
 
@@ -186,6 +186,7 @@ struct lxc_console {
 
 		/* the in-memory ringbuffer */
 		struct lxc_ringbuf ringbuf;
+	};
 };
 
 /*